The T1NKER Glossary

Movement

The engine of the watch. The movement is the internal mechanism that powers timekeeping. Movements can be mechanical (manual or automatic) or quartz (battery powered). Collectors generally geek out over mechanical movements.

Water Resistance

A rating that indicates how much water pressure a watch can withstand. Commonly expressed in ATM or meters. 3ATM means splash resistant only. 10ATM or 100m is suitable for swimming. 20ATM or 200m is suitable for diving. These ratings are tested under static pressure and do not account for the additional force of moving water.

Lume

Short for luminous material. Applied to watch hands and hour markers to allow reading in low light or darkness. Modern lume is typically Super-LumiNova, a non-radioactive photoluminescent material that charges in light and glows in the dark.

Service Interval

The recommended period between full mechanical servicing of a watch movement. Most manufacturers recommend servicing every 5–10 years. A service typically involves disassembly, cleaning, lubrication, and regulation of the movement.

Beat Rate

The number of times a mechanical watch movement oscillates per hour. Most everyday mechanical watches beat at 28,800 bph (beats per hour). A higher beat rate generally means smoother seconds hand movement and better accuracy. When you regulate a watch, you're adjusting how fast or slow it beats relative to true time.

Regulation

The process of adjusting a mechanical watch movement to improve its timekeeping accuracy. Regulation is done by moving a small lever on the movement that controls the effective length of the hairspring. A well-regulated watch should gain or lose no more than a few seconds per day.

Power Reserve

How long a mechanical watch will run on a full wind before stopping. A typical manual-wind watch has a 40–48 hour power reserve. Automatic watches wind themselves through wrist movement but will stop if left unworn long enough.

Automatic Movement

A self-winding mechanical movement that uses a rotor to wind the mainspring through the natural motion of the wearer's wrist. No battery required. If you wear it regularly, it stays wound.

Manual Wind

A mechanical movement that requires the wearer to wind the crown by hand, typically daily. Simpler in construction than an automatic, often found in vintage and dress watches.

NH35 / NH38

Popular Seiko-made automatic movements widely used in affordable and mid-range watches. The NH35 includes a date complication, the NH38 does not. These movements are reliable, serviceable, and a common starting point for watch modders and franken builders.

Mainspring

The coiled spring that stores a mechanical watch's energy. Winding (by hand or by the Rotor) tightens it, and it slowly unwinds to power everything else.

Balance Wheel

The weighted wheel that swings back and forth at a steady rhythm. It's the heartbeat of a mechanical watch.

Hairspring

The ultra-thin spring attached to the Balance Wheel that keeps its swing even. Tiny adjustments here change accuracy a lot, which is why Regulation happens here.

Escapement

The part that releases the mainspring's energy in tiny, even steps. It's what makes the tick.

Jewels

Synthetic rubies used as low-friction bearings at the spots that wear most. More jewels doesn't automatically mean a better watch. Most automatics need somewhere around 21 to 25.

Rotor

The weighted half-disc inside an Automatic Movement that spins as your wrist moves and winds the Mainspring.

Hacking

When pulling out the crown stops the seconds hand, so you can set the time to the exact second. The NH35 hacks. Older Seiko 7S26 movements don't.

Quartz

A movement regulated by a battery-powered quartz crystal vibrating 32,768 times per second. More accurate than mechanical, cheaper, and almost no maintenance. Not a lesser watch, just a different philosophy.

Solar

Quartz watches charged by light instead of a replaceable battery. Citizen calls its version Eco-Drive. Seiko just calls it Solar. Leave it in a drawer for months and it'll usually still be running.

Accuracy (s/d)

Measured in seconds per day, plus or minus. A Seiko NH35 is rated at -20 to +40 s/d. A certified Chronometer has to hit -4 to +6. Most quartz watches drift about 15 seconds a month.

Chronometer

A watch that passed 15 days of accuracy testing in different positions and temperatures by COSC, the official Swiss testing institute. It's a precision badge, not a guarantee that everything else about the watch is great.

Timegrapher

A tool that listens to a running movement and shows its rate (how fast or slow it runs), amplitude (how far the balance swings), and beat error (how evenly it ticks). One of the first tools to land on any watchmaker's bench.

Magnetization

When a watch spends time near magnets (phone cases, laptops, speakers, bag clasps), the Hairspring coils can stick together and the watch suddenly runs way fast. A cheap demagnetizer fixes it in seconds.

NH34 / NH36

More of Seiko's workhorse automatics. The NH36 adds a day wheel to the NH35 / NH38. The NH34 adds a GMT hand, and it has become the go-to engine for affordable mechanical GMTs.

Miyota

Citizen's movement brand. The 8215 is a no-frills budget workhorse. The 9015 is thinner and beats faster, and it powers a huge number of microbrand watches.

ETA / Sellita

The two big Swiss movement suppliers. ETA is owned by Swatch Group. Sellita built its business making near-identical alternatives, so the ETA 2824 and Sellita SW200 are practically twins. Odds are good a Swiss watch under a few thousand dollars runs on one of them.

Dial

The face of the watch. What most people think of when they picture a watch. Dials can be made from an enormous range of materials including enamel, lacquer, meteorite, wood, and more.

Case

The housing that holds the movement and dial. Cases come in a range of materials including stainless steel, titanium, gold, and various alloys. Case shape, size, and finishing are major factors in how a watch wears and looks.

Lug Width

The distance between the lugs (the protruding parts of the case where the strap or bracelet attaches), measured in millimeters. Lug width determines which straps and bracelets are compatible with a given watch. Knowing your lug width is essential for swapping straps.

Bezel

The ring surrounding the watch crystal. Bezels can be fixed or rotating and serve decorative or functional purposes. A dive watch bezel tracks elapsed time underwater. A GMT bezel tracks a second time zone.

Crown

The small knob on the side of the watch case used to set the time, date, and wind the movement. Crowns can be screwed down for water resistance or left unsecured on dress watches.

Sapphire Crystal

A watch glass made from synthetic sapphire, rated 9 on the Mohs hardness scale. Extremely scratch resistant. The standard for mid to high-end watches. Contrast with mineral crystal, which is cheaper and scratches more easily, and acrylic crystal, common on vintage watches.

Case Diameter

The width of the case, not counting the crown. It's the number everyone quotes, but it's only half the story on fit. See Lug-to-Lug.

Lug-to-Lug

The distance from the tips of the top lugs to the tips of the bottom lugs. This matters more than diameter for how a watch wears. If the lugs hang past the edges of your wrist, it's too big for you.

Case Thickness

How tall the watch sits off your wrist. Thinner slides under a cuff. Thicker reads as sporty. Anything under 12mm tends to feel easy to wear.

Chapter Ring

The ring between the dial and the crystal, often printed with minute markers. It adds depth and makes the dial look more finished.

Applied vs. Printed Indices

Hour markers. Applied indices are separate metal pieces attached to the dial. Printed ones are painted on. Applied usually reads as more premium because they catch light and add dimension.

Sunburst Dial

A dial finish brushed in rays from the center, so it flashes and shifts color as you move your wrist.

Sandwich Dial

Two dial layers stacked together. Cutouts in the top layer reveal Lume on the bottom layer, so the markers glow without being painted on. Panerai made it famous.

Cyclops

The magnifying bubble over the date window. Rolex's signature move. People love it or hate it, with almost nobody in the middle.

Screw-Down Crown

A crown that threads onto the case to keep water out. Unscrew it before setting the time, and always screw it back down after. Forgetting is how dive watches drown.

Display Caseback

A see-through caseback that shows off the movement. Also called an exhibition caseback.

Crown Guards

Raised shoulders on the case that protect the crown from getting knocked or snapped off. Standard on most tool watches.

Hesalite

A type of acrylic crystal. It scratches easily but buffs out with a little polish and won't shatter. The Speedmaster Moonwatch used it because shards of glass floating around a spacecraft are a bad idea.

Oyster Bracelet

A three-link bracelet with wide, flat links. Rolex's sporty classic, and the template for a huge share of steel bracelets today.

Jubilee Bracelet

A five-link bracelet with small center links that flex and catch light. Dressier than an Oyster. Rolex introduced it on the Datejust in 1945.

Solid End Links

The pieces that connect a bracelet to the case. Solid ones feel substantial. Hollow, folded ones rattle and are usually the first sign a bracelet was built to a price.

Spring Bars

The small spring-loaded pins that hold a strap or bracelet between the lugs. A spring bar tool is the first thing to buy if you want to change straps.

Quick-Release Strap

A strap with a small lever built into each spring bar, so you can swap it in seconds with no tools. The easiest way to make one watch feel like five.

NATO Strap

A single piece of nylon that threads under the watch, so if one spring bar fails, the watch stays on your wrist. The name comes from the NATO stock number given to the original British military strap.

FKM Rubber

A high-grade fluoro rubber used on dive and sport straps. It shrugs off sweat and saltwater and doesn't attract lint like cheaper silicone.

Tropic Strap

A vintage-style rubber dive strap with a woven, basket-like texture, first popular in the 1960s. The move if you want a modern diver to feel old school.

Micro-Adjust Clasp

A clasp you can loosen or tighten in small steps without removing links. Rolex Glidelock and Tudor T-fit are the well-known versions. Your wrist swells in the heat, so this matters more than you'd think.

Complication

Any watch function beyond basic timekeeping. Common complications include date, chronograph, moon phase, GMT, and tourbillon. The more complications, the more complex and typically more expensive the watch.

GMT

Greenwich Mean Time. A GMT complication allows the wearer to track a second time zone simultaneously. Often displayed via an additional hand pointing to a 24-hour bezel. Popular with travelers and watch nerds who just think they look cool.

Chronograph

A watch with a built-in stopwatch function. Operated via pushers on the side of the case. Chronographs are one of the most popular complications in collecting.

Day-Date

Shows both the day of the week and the date. Rolex has a whole model named after it, but plenty of $100 Seikos do it too.

Moonphase

A small window that tracks the phases of the moon with a rotating disc. Mostly romance, a little bit astronomy.

Power Reserve Indicator

A small gauge on the dial showing how much energy is left in the Mainspring, like a fuel gauge for your watch.

Tachymeter

A scale on the bezel or dial that, paired with a Chronograph, measures speed over a known distance. Time a car over one mile and read the speed straight off the bezel.

Small Seconds

A seconds hand that lives in its own little sub-dial instead of sweeping from the center. Common on dress watches and older designs.

Flyback

A Chronograph you can reset and restart with a single push while it's running, instead of stop, reset, start. Built for pilots timing back-to-back legs.

World Timer

A complication that shows the time in all 24 time zones at once, using a ring of city names around the dial. A step beyond a GMT.

Perpetual Calendar

A calendar that knows how many days are in each month and accounts for leap years. Set it right and it won't need correcting until the year 2100.

Tourbillon

A rotating cage that holds the Escapement, invented by Abraham-Louis Breguet around 1801 to average out gravity's pull on pocket watches. On a wristwatch, it's mostly a flex of craftsmanship, and that's fine.

Seiko

精工 · "exquisite workmanship"

The name traces back to Seikosha (精工舎), the clock factory Kintaro Hattori opened in Tokyo in 1892. Seiko roughly means "exquisite workmanship," and it sounds like the Japanese word for "success." Fitting for the company that released the world's first quartz wristwatch, the Astron, in 1969.

JDM

"Japanese Domestic Market"

Models made for sale inside Japan. They sometimes come with different dials, kanji day wheels, or reference numbers you can't buy anywhere else, which is exactly why collectors hunt them down.

Kanji Day Wheel

漢字 · "Chinese characters"

A day-of-the-week wheel that lets you switch between English and Japanese characters. Common on Seiko 5 and older Seiko divers. Some people swap one in on purpose as a quiet nod to where the watch came from.

Seiko Nicknames

Collectors rarely say Seiko reference numbers out loud. They use nicknames: Turtle (cushion-shaped case), Samurai (sharp, angular case), Sumo (big and bold), Monster (toothy bezel and aggressive hands), Tuna (a shrouded case shaped like a tuna can), Willard (the diver Martin Sheen wore in Apocalypse Now), and Alpinist (the field watch with a compass bezel). If someone says they just picked up a Turtle, they're not talking about a pet.

Urushi

漆 · "lacquer"

Lacquer made from the sap of the urushi tree, used in Japan for thousands of years. Artisans hand-apply and polish layer after layer until the black looks wet and bottomless. It's notoriously hard to bond to metal, which is part of why urushi dials cost what they do. You'll find it on Seiko Presage and Grand Seiko pieces.

Maki-e

蒔絵 · "sprinkled picture"

Fine metal powder, usually gold, sprinkled onto Urushi while it's still tacky, then polished by hand. Used for markers, logos, and tiny details. Taka maki-e is the raised version, building the lacquer up so the markers sit in 3D.

Byakudan-nuri

白檀塗 · "sandalwood coating"

An Urushi technique that puts metallic powder under layers of translucent, reddish lacquer. The result glows warm, like polished sandalwood, when light hits it. Seiko has used it on Presage sub-dials.

Shippo

七宝 · "seven treasures"

Japanese enamel work. A glassy glaze is applied, kiln-fired, and polished again and again to build rich color gradients. The name refers to the seven treasures of Buddhist scripture, a nod to how precious the finish looks. On Seiko Presage Shippo dials, artisans check for bubbles under a microscope.

Hōrō

琺瑯 · "enamel"

The Japanese word for enamel. On watches it usually means a smooth, bright white dial fired at high heat, with a soft depth that holds its color for decades. Seiko Presage enamel dials are one of the most accessible ways to own one.

Arita Porcelain

有田焼 · "Arita ware"

Porcelain from the town of Arita in Saga Prefecture, where it has been made for over 400 years. Seiko worked with Arita craftsmen to make porcelain dials thin and strong enough to live inside a watch. It has a milky glow nothing else quite matches.

Asanoha

麻の葉 · "hemp leaf"

A geometric star pattern based on the hemp leaf, used in Japanese design since the Heian period, over a thousand years ago. Hemp grows fast and strong, so the pattern stands for growth and good health. It's pressed into the dials of Seiko's Presage Sharp Edged series.

Zaratsu

ザラツ研磨 · "Zaratsu polishing"

Grand Seiko's mirror polishing technique. A hard, flat polishing plate held at an exact angle creates distortion-free surfaces with razor-sharp edges between them. Fun fact: the name isn't ancient Japanese. It comes from Sallaz, the Swiss company whose polishing machines Seiko bought decades ago.

Grand Seiko Style

"44GS"

The design rules Grand Seiko locked in with the 44GS in 1967, credited to designer Taro Tanaka: flat polished surfaces, sharp facets, bold multi-faceted hands and markers, and a case shaped to catch light. Nearly every Grand Seiko made today still follows them.

Hi-Beat

A movement that runs at 36,000 vibrations per hour, or 10 beats per second, compared to the 21,600 or 28,800 most automatics run at. Faster Beat Rate, smoother sweep, steadier accuracy. Grand Seiko's Hi-Beat calibers are the famous ones.

Spring Drive

Seiko's hybrid. A Mainspring powers it like any mechanical watch, but instead of a traditional Escapement, a quartz crystal and a magnetic brake control the speed. No battery. The seconds hand glides with no tick at all, and accuracy lands around a second a day.

Nature Dials

Grand Seiko's textured dials, inspired by the landscapes around its studios. The Snowflake recalls the snow-covered mountains near the Shinshu studio. The White Birch, or Shirakaba (白樺), mirrors the birch forest outside the Shizukuishi studio. The texture is pressed or etched, then plated so it shifts as the light moves.

24 Sekki

二十四節気 · "24 solar terms"

The traditional Japanese calendar splits the year into 24 seasons of about 15 days each. Grand Seiko designs dials around them, like Shunbun for the spring equinox. A collection that takes the passage of time literally.

Shizukuishi & Shinshu

雫石 / 信州

Grand Seiko's two main studios. Mechanical calibers are made in Shizukuishi, in the shadow of Mt. Iwate. Spring Drive and quartz come from the Shinshu studio in Nagano. When a collector name-drops either one, they're telling you where the movement was born.

Homage Watch

A watch that is inspired by or closely resembles a more expensive, iconic timepiece without directly copying trademarks or logos. Homage watches are legal, often well-made, and a legitimate entry point into the hobby. The debate around them is one of the most heated in watch collecting. T1NKER covers them honestly.

Franken Build

A watch assembled from parts sourced from different watches, often different references or even brands. Named after Frankenstein. A well-executed franken build can produce a unique timepiece that performs as well as any stock watch. A bad one is just chaos on a strap.

Watch Modding

The practice of customizing a stock watch by swapping parts such as dials, hands, bezels, or crowns. Modding is a growing segment of the hobby and a gateway into understanding how watches are assembled.

Patina

The natural aging and discoloration of watch dials, hands, and cases over time. In vintage collecting, patina is often desirable and adds to the character and value of a piece. Tropical dials, which develop a brown tone from UV exposure, are among the most sought-after examples.

Tropical Dial

A vintage watch dial that has shifted in color over decades of UV exposure, typically from black or dark tones to brown, chocolate, or caramel. Tropical dials command significant premiums in the vintage market.

Grail

The watch at the top of your list. The one you've wanted for years. It doesn't have to be expensive. It just has to be yours.

Beater

A watch you wear without worrying about it. Hiking, yard work, the gym. Every collection needs one.

Wrist Check

Posting a photo of what's on your wrist today. The universal greeting of watch social media.

Rotation

The watches you actually wear on a regular basis, as opposed to the ones sitting in the box.

Microbrand

A small, usually independent watch company that sells mostly online. Microbrands are where a lot of the most interesting designs and best values come from right now.

WIS

Watch Idiot Savant. What collectors call themselves once they can name a movement from a caseback photo. Said with affection.

Replica

An unauthorized copy that uses another brand's name or logos. Also called a "rep" or fake. This is different from a Homage Watch, which borrows a look without pretending to be the original. Replicas are counterfeits, and selling them is illegal.

Full Kit

A watch sold with everything it originally came with: box, papers, warranty card, hang tags, extra links. Also called "box and papers." Full kits sell for more, sometimes a lot more.

Reference Number

The model number that identifies a specific version of a watch. Two watches that look almost identical can have different references with very different values, so this is the first thing to check.

Serial Number

The unique number on an individual watch. It can help date the watch and check it against stolen-watch databases.

AD

Authorized Dealer. A store officially approved by the brand to sell new watches with a full factory warranty.

Gray Market

New or unworn watches sold by dealers who aren't authorized by the brand. Prices can be lower (or higher, for hyped models), but the manufacturer warranty may not apply.

MSRP vs. Market Price

MSRP is the brand's official retail price. Market price is what watches actually sell for on the secondary market. Hyped models trade way above MSRP. Plenty of others trade well below it.

Pre-Owned

A watch that's had a previous owner. One of the best ways to stretch a budget, as long as you buy from someone you trust.

Condition Terms

The shorthand sellers use: Unworn (never worn), LNIB (like new in box), Mint (no visible wear), Excellent (light wear), and so on down. Always ask for photos, because everyone's "excellent" is different.

Overpolished

A case that's been polished so many times its original sharp edges and lines are gone. It's one of the biggest value killers on vintage and high-end pieces.

Redial

A dial that's been refinished or repainted. Sometimes it's a respectable restoration, sometimes it's hiding damage. It should always be disclosed, and it changes the value.

Flipper

Someone who buys watches to resell for a profit. It's a real part of the market, from people moving a single piece to full-time dealers. Know who you're buying from.