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Just forget about the Nautilus, the Patek Philippe Grand Complications are the real deal.And, there is one grand complication to rule ‘em all: the perpetual calendar chronograph. The reference 3970 was introduced in 1986 as the successor to the legendary and ultra-collectible reference 2499 perpetual calendar chronograph.This ref. 3970EJ (E = étanche, which means waterproof in French; J = jaune, for gold) is a third-series execution dating back to 1992. The watch features a 36 mm 18k yellow-gold case with lovely pump pushers and a solid gold screw down case back. The silvered dial sports 18k yellow-gold pointed baton indexes and matching baton hands. Two apertures at the 12 o’clock position reveal the day and month mechanism. The dial features three sub-dials. The recessed sub-dial at the 9 o’clock position displays a running seconds as well as a 24-hour hand while the recessed sub-dial at the 3-hour position incorporates a 30-minute chronograph counter and a leap year indicator. Finally on the lower sub-dial we find a charming moon phase indicator, which is surrounded by a date complication.The watch comes on a chocolate brown rubber and leather-lined Patek Philippe strap with a signed buckle. An extract of the archives is included as well!