Patek Philippe Calatrava 3410 J AM

Brand Patek Philippe, Geneva Model ‘Amagnetic’ (Amagnétique) Retailed by Beyer, Zürich (Switzerland) Year circa 1962 Reference Ref. 3410 J AM (Amagnetic) (2nd series) Movement No. 731 739 Calibre 27-AM 400, manual-winding, 18 jewels Case No. 2 630 360 (by Edouard Wenger, Geneva) Material/s yellow gold (18-carat) Bracelet leather strap Buckle yellow gold (18-carat) aftermarket pin-buckle Dimensions Ø 35 mm. Thickness 9.9 mm. Signature dial, case and movement Accessories Extract from the Archives Patek Philippe Ref. 3410 J AM (Amagnetic) (2nd series), anti-magnetic, thin lugs, silver dial, thin indexes; made for the Swiss market, retailed by Beyer; nicknamed ‘Flat Amagnetic’ and ‘double signature’ by collectors; yellow gold (18-carat) -- An antimagnetic flat wristwatch, the only one known with Beyer double signature -- Yellow gold (18-carat), manual-winding, round-shaped, anti-magnetic gentleman’s wristwatch, with subsidiary seconds at 6 o’clock. -- Case: two-piece, polished, cylindrical case-band, concave bezel, lugs turn slightly downwards, snap-on flat case-back; polished ‘Calatrava’ crown. Dial: silver colour, with yellow gold applied radiating thin indexes, external minute track divided five by five with black painted radiating lines; ‘Amagnetic’ mention at 12 o’clock; yellow gold ‘Bâton’ hands. Movement: calibre 27-AM 400, manual-winding, 18 jewels, rhodium-plated with ‘fausses côtes’ decoration, going barrel, straight-line lever escapement (with gold lever), free-sprung Gyromax balance, self-compensating Breguet hairspring, adjusted to heat, cold, isochronism and 5 positions, Geneva Quality Hallmark (“Poinçon de Genève” / Geneva Seal). -- The Extract from the Archives, dated April 28, 2006, mentions that this watch was made in 1962 and sold on April 11, 1963.