This Patek Philippe 3940G is a refined expression of one of the maison's most admired perpetual calendars, presented in white gold — among the scarcer metals for the reference — and offered in the exceptional state of factory sealed and wholly untouched, a condition rarely encountered on a Patek Philippe of this stature. Released during the Quartz Crisis, the 3940 stood as a statement of the house's commitment to mechanical high horology, and remains one of the most elegant perpetual calendars it has produced. Powered by the automatic calibre 240 Q with its ultra-thin micro-rotor, it displays a full perpetual calendar with moon phases and leap-year indication across a beautifully balanced three-subdial layout. The white-gold case measures 36mm across and just 9mm in thickness, a remarkably slim profile that lets a grand complication wear with everyday ease. A silver dial lends the composition clarity and quiet refinement. A benchmark perpetual calendar preserved in extraordinary, untouched form.