What “Complication” Actually Means
The term has nothing to do with difficulty of use. It comes from the Latin complicare — to fold together — referring to the additional mechanisms folded into a movement on top of the basic timekeeping train. A simple watch with three hands (hours, minutes, seconds) has no complications. Add a date window and you have one. Add a stopwatch function and you have another.
Watchmakers classify complications by complexity. Simple complications add a handful of parts. Grand complications — the highest tier — can add hundreds, and may take a single skilled watchmaker months or years to build.
Simple Complications
Date display
The most common complication in the world. A disc printed with the numbers 1–31 advances one position every 24 hours. Most date mechanisms need manual correction at the end of short months (February, April, June, September, November) because they can’t automatically account for months with fewer than 31 days. Servicing impact: Minimal. A few extra parts, easily maintained.
Day-date display
Shows both the day of the week and the date simultaneously. Requires two separate disc mechanisms and the logic to advance both correctly. Popular on dress watches. The Rolex Day-Date made this complication famous. Servicing impact: Low, but requires attention to two correction mechanisms during service.
GMT / dual time zone
A second hour hand — usually with a distinctive colour or shape — makes one rotation every 24 hours, allowing the wearer to read two time zones simultaneously. An additional crown position or pusher adjusts the secondary hand independently. Genuinely useful for anyone who travels or works across time zones. Servicing impact: Moderate. The GMT mechanism adds a sub-train that requires careful lubrication.
Power reserve indicator
A sub-dial or sector on the dial shows how much energy remains in the mainspring. Common on automatic watches to indicate when winding is needed. Useful rather than decorative. Servicing impact: Low. The indicator mechanism is simple but must be properly calibrated after service so it reads accurately.
The Chronograph
The chronograph deserves its own section. It is by far the most popular moderate complication — a built-in stopwatch function operated by pushers at the 2 and 4 o’clock positions. Pressing the top pusher starts timing; pressing it again stops it; pressing the bottom pusher resets.
Column-wheel chronograph
The traditional architecture. A star-shaped column wheel controls the start/stop/reset sequence. Smooth to operate, more complex to build, considered more prestigious. Found in high-end chronograph movements from ETA, Valjoux, and in-house calibers.
Cam and lever chronograph
The simplified, more cost-effective architecture. Uses a cam and lever system instead of a column wheel. Functionally equivalent but the pusher feel is slightly less refined. Common in mid-range chronograph watches.
Chronograph servicing cost: A chronograph movement has roughly 200–250 parts compared to 50–80 in a simple three-hand movement. Service labour approximately doubles. If you are buying a chronograph as a first watch, factor in service costs every 5–7 years when budgeting for long-term ownership.
Grand Complications
Moon phase
A rotating disc showing the current phase of the moon through an aperture in the dial. Driven by a 59-tooth gear (the lunar cycle is 29.5 days), a basic moon phase display drifts by about one day every two and a half years. High-accuracy moon phase displays use a 135-tooth gear and drift by one day every 122 years. Why it exists: Originally practical for farmers and sailors. Today it is primarily decorative — one of the most visually beautiful complications in watchmaking.
Perpetual calendar
A perpetual calendar automatically accounts for the different lengths of all months — including February in leap years — without manual correction. The mechanism “knows” how long each month is via a 48-month cam that encodes every month of a four-year cycle. A correctly maintained perpetual calendar only needs correction once every 100 years (the year 2100 will not be a leap year despite being divisible by 4). Servicing impact: High. The perpetual calendar mechanism is intricate and requires specialist knowledge to service and reset correctly.
Minute repeater
On demand, the watch chimes the time acoustically — hours on a low-pitched gong, quarter-hours on a two-tone sequence, minutes on a high-pitched gong. A slide on the case edge releases a spring-loaded striking mechanism. No battery or electronics involved: the energy comes entirely from the mainspring. Minute repeaters are considered the most difficult complication to manufacture correctly; a skilled watchmaker may spend months calibrating the tone and timing of a single piece. Among the rarest and most expensive complications in the world.
Tourbillon
A rotating cage that carries the escapement and balance wheel, completing one rotation per minute to average out the effect of gravity on timekeeping. Invented in 1801 by Abraham-Louis Breguet to improve the accuracy of pocket watches worn vertically in waistcoat pockets. In a wristwatch — which constantly changes orientation — the practical accuracy benefit is marginal. Tourbillons are bought for their mesmerising visual drama and the extraordinary craft they represent. They are, genuinely, one of the most beautiful mechanical objects ever made.
Complications vs. Servicing: What to Expect
| Complication | Additional parts (approx.) | Service interval | Relative service cost |
|---|---|---|---|
| None (3 hands) | 0 | 5–7 years | Base |
| Date | ~15 | 5–7 years | Low (+10–15%) |
| GMT / dual time | ~30 | 5–7 years | Low–moderate (+20–30%) |
| Chronograph | ~150 | 5–7 years | High (+80–150%) |
| Perpetual calendar | ~300 | 5–10 years | Very high |
| Minute repeater / Tourbillon | 400+ | Varies | Specialist only |
From our workshop: The most common complication we service at Iglisi Watch is the date mechanism. We also see many chronographs where the pusher springs have weakened or the column wheel has worn — problems that develop when the watch is serviced infrequently. Any complication is best served on a regular schedule, not when it fails.
Have a Complicated Watch That Needs Servicing?
Our workshop in Durrës services chronographs, date mechanisms, and GMT complications on-site. For grand complications we assess and advise on the best service route. No appointment needed — walk in with your watch and we’ll give you an honest estimate. Family-owned and trusted since 2009.
Rruga Aleksander Goga · Durrës 2001 · Albania · +355 67 636 0510
Published by Iglisi Watch · Durrës, Albania · June 2026. Part counts are approximate industry averages and vary by manufacturer. Service intervals are general guidance; always follow the manufacturer’s recommendation for your specific caliber.