Patek Philippe’s commemorative watch created for its 150th anniversary in 1989 was the Calibre 89.
Patek Philippe developed the Calibre 89 as an exceptionally complicated mechanical timepiece to mark the company’s sesquicentennial. The watch combined numerous functions, including a perpetual calendar, a moon-phase display, a split-seconds chronograph, and astronomical indications.
Its movement contained 33 complications and was made from 1,728 individual components. Patek Philippe produced four examples, using different case materials: white gold, yellow gold, rose gold, and platinum. The design was deliberately large and highly intricate rather than intended as an everyday wristwatch.
The Calibre 89 is sometimes confused with Patek Philippe’s later Grandmaster Chime, introduced for the company’s 175th anniversary in 2014. The anniversary and model name therefore matter: Calibre 89 belongs specifically to the 150th-anniversary celebration.