PATEK PHILIPPE REF. 3423 YELLOW GOLD Patek Philippe, GenËve, Ref. 3423. Made circa 1960. Very fine and rare, 18K yellow gold wristwatch. Accompanied by the original fitted box. Two-body, solid, polished, stepped inclined bezel, straight lugs, snap on case back. Matte silver with painted radial Roman numerals, outer minute track. Black baton hands. Cal. 27-SC, stamped twice with the Seal of Geneva quality mark, rhodium-plated, fausses cotes decoration, 18 jewels, straight-line lever escapement, monometallic balance adjusted to heat, cold, isochronism and 5 positions, shock absorber, self-compensating Breguet balance spring, swan neck micrometer regulator.