5905P | Annual Calendar | Chronograph | Platinum a-lange-sohne while the balance as well

while the balance as well as the base of the escapement cocks are not only fashioned from solid yellow gold

the retrograde date is considered one of the most difficult complications to execute

and was adopted by Breguet

which can be removed

This Andersen Genève Perpetual Calendar is in very good condition overall

5905P | Annual Calendar | Chronograph | Platinum a-lange-sohne while the balance as wellThis 5905P* features an annual calendar complication with chronograph functions, a rarely seen combination for watches that has become an integral part of Patek Philippes modern annual calendar offerings. The 5905P has a mixed heritage, as it draws upon two previous annual calendar pieces, the reference 5960 and the reference 5205 respectively, as demonstrated by its blended reference number. The watch borrows the sectors and elongated indexes found