Patek Philippe. A fine and extremely rare stainless steel automatic wristwatch with date, light tropical dial and 16 mm. bracelet Signed Patek Philippe, Genève, Nautilus model, ref. 3700/1, movement no. 1’309’418, case no. 540’850, manufactured in 1979 Movement: cal. 28-255 C, automatic, stamped with the Geneva seal, 36 jewels, signed Dial: lightly tropicalized, signed Case: two-part secured by four screws in the band, signed, 42 mm. wide, underside of bezel numbered 850 With: stainless steel 16 mm. Patek Philippe Nautilus bracelet with deployant clasp, approximate overall length of bracelet 190 mm., Extract from the Archives confirming production of the present watch in 1979 and its subsequent sale on 5 February 1981.