Patek Philippe Annual Calendar Moonphase World Timer While those pieces are indisputably

While those pieces are indisputably cool

This particular X-serial example dates to late 1991 and features an excellent case and bracelet

it comes paired to a white ceramic multi-link bracelet with a spring-loaded deployant clasp

which has fascinated mathematicians and artists for two thousand years

While this particular reference was offered in a sportier steel variant

Patek Philippe Annual Calendar Moonphase World Timer While those pieces are indisputablyThe annual calendar is a complication invented by Patek Philippe. While it plays second fiddle to the perpetual calendar in the minds of most collectors, the reality is that the construction of this calendar mechanism is equally challenging, and in some cases, requires even more components. The Reference 5035 was Patek's first Annual Calendar model launched in 1996, and set the bar for all that followed including those from competitors. This