The Language of Complications

In watchmaking, a complication is any function beyond the simple display of hours and minutes. The name implies difficulty — and rightly so. Each additional function requires additional components: more gears, more levers, more springs, more potential failure points. A chronograph might add 250 components to a movement. A perpetual calendar, close to 500. This is why complications carry prestige. They are problems that have been solved in metal, inside a case the size of a walnut.

The chronograph is perhaps the most widely understood complication: press a pusher, and a seconds hand begins tracking elapsed time; press again to stop; press a third time to reset. The mechanism that reads the split-second difference between the running movement and the stopped chronograph hand is called a column wheel — and the quality of its execution separates an instrument from a trinket.

The GMT hand — a fourth hand that circles the dial once every 24 hours — was developed in the 1950s for airline pilots navigating time zones before GPS. A second time zone is read against a 24-hour bezel. Set the bezel to your home city; the GMT hand shows you what time it is there while the main hands tell you local time. Elegant, functional, and more useful today than it has ever been.

The moonphase is, among complications, perhaps the most poetic. A rotating disc bearing two painted moons advances by one tooth every 24 hours and 44.3 minutes — the average length of the lunar day. After 29.5 days, a full cycle completes. The best moonphase modules deviate by one full day only after 120 years of operation. That precision in service of something as ineffable as the moon is, we think, what makes horology an art.