Fine and rare yellow gold water-resistant square wristwatch with unusual lugs and sliding sides. Signed Patek Philippe & Co., Genève, ref. 1486, movement n°951'097, case n°644'943, manufactured in 1940's Cal. 10'''110 circular mechanical movement, 18 jewels, micrometer regulator, argenté dial, with applied gold indexes and baton hands, subsidiary seconds, square case with sliding sides to protect against water entry, cylindrical lugs, case, dial and movement signed 26 mm. wide & 34.8 mm overall length.