Complication (horology)

Common complications include date or day-of-the-week indicators, alarms, chronographs (stopwatches), and automatic winding mechanisms.

discount non-horological features (even those tangential to timekeeping such as winding limitations mechanisms or power reserves) as being true complications.

[4] The initial ultra-complicated watches appeared due to watchmakers' ambitious attempts to unite a great number of functions in a case of a single timepiece.

The mechanical clocks with a wide range of functions, including astronomical indications, suggested ideas to the developers of the first pocket watches.

[8][9][10][11] Two Patek Philippe Calibre 89 also currently rank among the top 10 most expensive watches ever sold at auction, with final prices over 5 million US dollars.