Patek Philippe Annual Calendar Flyback Chronograph Tray backside of a Lange is

backside of a Lange is just as beautiful as the front

This particular Reference 810 also features the desirable AOPA logo on the dial

Eberhard was an early proponent of wrist-worn chronographs

is one such timepiece

from Dubey & Schaldenbrand to LeGran

Patek Philippe Annual Calendar Flyback Chronograph Tray backside of a Lange isThe 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 by no means a simple feat, and requires impressive micro engineering and design acumen to execute well. Able to account for months of different lengths, it only requires manual adjustment once per year at the end of February. However,