Patek Philippe Annual Calendar Moonphase modern a glossy black Tritium dial

a glossy black Tritium dial with applied indices and a matching handset

this piece is an incredible offering

the Reference 3445 was introduced in 1961 and saw production through the early 1980s

They were used for everything

Patek Philippe Annual Calendar Moonphase modern a glossy black Tritium dialIn 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