chronograph "Piccolino" 3055, ‘30s 18k gold round case, n.35941, olive pushers. Two-tone aviator-style salmon dial, multi-scale, painted indexes and arabic numerals. Hand-winding movement. Rolex leather strap and gold plated Rolex buckle. Size: 30 mm. Notes: Reference 3055 was originally launched in the 1930s, and advertised as the world's smallest chronograph wristwatch. First-series specimens feature oval-shaped buttons, such as the present watch, while second-series models, relaunched in the 1950s, feature rectangular chronograph pushers.