Patek Philippe Perpetual Calendar Chronograph 3970

Patek Philippe Ref. 3970, First Generation So called “Snap on Case Back”, Produced from the First Batch, No. 875006 / 2824116, circa 1986 A 18k yellow gold chronograph and perpetual calendar wristwatch with moon phases, snap on case back and presentation wooden box Case: round, snap on case back, two round chronograph pushers, fluted lugs, correctors on the band to adjust the calendar and moon phases, signed Dial: silvered two tone with baton applied indexes, three subsidiary dials for the chronograph function, date, seconds and 24h indication, aperture for moon phases, two windows for days of the week and months, outer minute track with 1/5th second graduation, signed Movement: mechanical with manual winding, calibre 27-70 Q, nickel finished, Côtes de Genève decoration, stamped with the Geneva Seal, 24 jewels, lever escapement and balance spring, adjusted to temperature and isochronism, signed Clasp/Buckle: gold buckle stamped PPCo, signed Dimensions: 36 mm Weight: 76 g Accessories: Patek Philippe presentation wooden box.