Patek Philippe’s reference 3970 marked the third generation of the brand’s iconic serialised perpetual calendar chronograph, following the legendary ref. 1518 and 2499. Introduced in 1986, it retained the classic design language of its predecessors, including pump-style pushers and downturned stepped lugs, though the case diameter was slightly reduced from 37.5mm to 36mm. Technically, the watch was significantly upgraded with the CH 27-70 Q movement, based on the Lemania 2310 and heavily modified by Patek Philippe, replacing the earlier Valjoux calibre. The dial was also enhanced to include leap year and 24-hour indicators, improving its functionality.

The present third-series example from 1993 stands out with a semi-glossy black dial featuring chaton-set diamond hour markers and a German calendar, offering a luxurious twist on the classic design. Unlike the more common silvered opaline dials, this configuration adds visual depth and elegance. The hallmarks are stamped on the lugs, a detail highly prized by collectors of reference 3970. Offered in well-preserved condition, this fresh-to-the-market timepiece is an ideal acquisition for those who appreciate Patek Philippe’s horological excellence with a touch of opulence.