A wristwatch is a clock small enough to wear on your wrist. That sounds obvious, but it is the whole definition, and it is worth sitting with for a second: every watch that has ever existed, from a twenty-dollar drugstore quartz to a six-figure Swiss mechanical, is the same machine at heart. A case holds an engine, the engine moves hands around a dial, and you read the time off of it. Everything else is details and decoration. This lesson covers the details you need to know so that the rest of this site, and honestly the rest of the watch world, makes sense.
The parts you can see
Start with the watch on your wrist, or the one in the photo below, and go piece by piece.
A Tissot 1853 watch. Photo: Wikimedia Commons, CC0.
The dial is the face of the watch, the part you look at. The hands are the thin pointers that move across it: short one for hours, long one for minutes, and usually a thin one for seconds. The hour markers (also called indices) are the numbers, dots, or little bars the hands point to, one for each hour. Put the hands and the markers together and you can read the time, which is the whole job.
The dial sits inside the case, the metal (or sometimes plastic or ceramic) shell that holds everything. Think of it as the watch’s body. The clear cover over the dial is the crystal, and yes, it is called a crystal even when it is glass or plastic. Around the crystal sits the bezel, the ring that holds the glass in place. On some watches it just sits there looking nice. On others, like dive watches, it rotates and works as a timer.
On the side of the case, usually at the three o’clock position, there is a small ridged knob called the crown. You use it to set the time, and on many watches it does more than that (winding, changing the date), which is why the crown gets its own reputation. At the top and bottom of the case are the lugs, the little projections the strap attaches to. They look like small horns reaching out to grab the band. The band itself is either a strap (leather, rubber, fabric, nylon) or a bracelet (linked metal). Both do the same job: they keep the watch on your wrist.
The part you can’t see
Turn the watch over. Behind the dial, packed into the case, is the movement. The movement is the engine: the mechanism that counts time and drives the hands. Watch people also call it the caliber (or calibre, if you want to sound European about it). A caliber is just a specific model of movement, like a model of car engine. The same caliber can appear in many different watches, the same way one engine shows up in several car models.
There are two fundamentally different kinds of movement, and the difference is the single most important thing a beginner can learn. A mechanical movement runs on a wound spring and a stack of tiny gears, no battery, no electricity. A quartz movement runs on a battery and a vibrating crystal of quartz. The next lesson is about exactly this, because people will assume you already know it and you should not have to.
A Fossil watch. Photo: Wikimedia Commons, CC BY-SA 4.0.
What a watch actually does
Every watch tells the time. Hours, minutes, and usually seconds. That is the baseline. Anything a watch does beyond that is called a complication, which is watch-world jargon for “extra feature.” The name is silly (a date window is not complicated), but it is the word everyone uses, so it is worth learning now.
The most common complication is the date, a little window on the dial, usually at three o’clock, that shows the day of the month. Beyond that you get things like a chronograph (a built-in stopwatch with extra pushers on the side of the case), a day-date display, or a GMT hand that tracks a second time zone. None of these are required. A watch that only tells the time, with no date and no extras, is called time-only, and plenty of collectors consider it the purest form of the thing.
One more term that will come up constantly: water resistance. Watches are rated for how much water pressure they can take, printed on the dial or the case back in meters or atmospheres. Take these numbers with a grain of salt (a “30 meter” rating does not mean you can swim with it), but the concept matters: a watch is a sealed little machine, and how well it is sealed decides where you can take it.
Keep digging
Now that the vocabulary is in place, these pages go one level deeper on the ideas this lesson touched.
Why it matters
Watch writing is full of jargon used without explanation, as if everyone was born knowing what a caliber is. Now you know: dial, hands, markers, case, crystal, bezel, crown, lugs, strap or bracelet, movement, complication. That is the whole skeleton. Every watch review, every product page, every argument on a forum is built out of these words, and you can now follow along. The next lesson opens up the movement itself, which is where things get genuinely interesting.
Thanks for reading this.
Course Index | Next: What makes it tick?
