A GENTLEMAN'S 18K SOLID GOLD PATEK PHILIPPE WRISTWATCH CIRCA 1970s, REF. 3731 D: Black Onyx dial with original gilt hands. M: 18 jewel manual wind movement signed Patek Philippe & Co, numbered. C: Octagonal case with stepped bezel, signed Patek Philippe Geneve & numbered, hallmarked 18k, Onyx crown, case measures approx. 34mm length/34mm width. S: Original black Patek Philippe strap with original 18k solid gold pin buckle.