3940J, First Series, Perpetual Calendar, Yellow Gold

A First Series ref. 3940J, one of fewer than 1000 examples. Featuring a 'Type B' Stern configuration with stepped subdials, this early example still employed many manual dial-making techniques such as manually finished apertures and applied indices. Just 8mm thanks to the revolutionary micro-rotor calibre 240 Q, the 3940 has defined the design of the perpetual calendar as a complication since. This example includes the rarely seen and early ellipse-style deployant clasp alongside its full set, with hallmarks well-preserved at 9.