Watch complication

A watch complication generally means a function beyond the basic display of hours, minutes and seconds. The word describes an additional technical function, not damage or a malfunction.

Functions with different purposes

A chronograph measures elapsed time, while calendar functions provide date or calendar information. Displaying multiple time zones is another type of additional function. Patek Philippe uses these groups as examples in its presentation of complications. Each function must nevertheless be investigated model by model.

The term is also used more broadly. Fondation Haute Horlogerie includes the tourbillon and self-winding in an extended complication category. A sales description should therefore name actual functions rather than merely provide a complication count. Different counting methods can produce different totals.

What to investigate when buying second-hand

A watch with several small hands is not necessarily a chronograph. Small hands may serve other purposes. Identify the correct reference and instructions, and distinguish a function included in the model from one actually tested on the individual watch.

As a practical example, a watch might display the date and a second time zone, while the seller has only checked that the hands move. The condition of the other functions should then be described as unknown. Retain service paperwork as part of the watch's documentation and ownership history. Do not adjust or activate an unfamiliar mechanism using instructions for a different movement.

Next step: Compare stated functions and condition in OBA's wristwatch category. For questions about an older watch, its reference, clear photographs and service history are more useful than an undocumented complication count.

Sources: Fondation Haute Horlogerie's definition and Patek Philippe's functional categories.