Type 3B, Steel 5070J This perpetual calendar blends Vacheron

This perpetual calendar blends Vacheron Constantin's storied history of unusual time displays to a contemporary complicated calendar

with an original dial signed Tiffany & Co above the Audemars Piguet signature

The finishing

including a new bridge geometry for the flatter governor

A First Series ref

Type 3B, Steel 5070J This perpetual calendar blends VacheronA Type 3B, Naoya Hida's first complicated watch. Featuring a hand engraved solid gold moonphase advanceable via the crown, the Type 3B was made in 10 15 examples annually. It featured a third generation thinner case, German silver dial with hand engraved urushi filled Roman numerals, and blued steel hands.