Watch Terminology Dictionary

A calendar that automatically adjusts for leap years. Mechanically, it is broadly divided into continuous types with planetary gears and discontinuous types with cams and snails. A representative example of the former is the Ulysse Nardin "Perpetual Ludovico," and a representative example of the latter is the IWC "Da Vinci Perpetual Calendar." For more information,永久カレンダーSee.