Patek Philippe Annual Calendar Factory Certified Pre-Owned Think that a watch movement

Think that a watch movement is either mechanical or quartz

These "Tre-Tacche" watches from the late 1930s and 1940s

in-house TAG Heuer Calibre 16 automatic movement

More on that HERE

it also comes with its inner box

Patek Philippe Annual Calendar Factory Certified Pre-Owned Think that a watch movementIn 1991, the soon to be graduates at the Geneva School of Engineering were presented with their final project prior to receiving their diploma simplify the perpetual calendar. Although the task was easier said than done, their work led to the inception of the annual calendar complication, patented by Patek Philippe in collaboration with the bright engineering minds at the GSE. Five years later, Patek debuted the Reference 5035 which marked the worlds