Vintage Chopard Happy Diamonds 18K Gold Alligator Strap Watch Orig Certificate. This is a beautiful vinatge Chopard lades happy diamond watch reference number 20/4305. They still make this model with a retail price of 10,000. The watch is set with 5 moveable diamonds in the face and two diamonds at end of each face. The watch has a black alligator strap with a chopard 18k gold buckle. The face is marked Chopard Happy Diamonds 20/4305 229664 5198 strap is marked Chopard. The face measures 22mm by 31mm. The watch comes with the original Chopard certificate from Dickson watch and jewellery Hong Kong sold on Aug 1987. The watch measures 8 1/8" long. It will be serviced and cleaned. The watch comes with the original chopard tool.