PATEK PHILIPPE & CO SQUARED YELLOW GOLD WRISTWATCH PATEK PHILIPPE & CO WATCH NO. 6310XX 18kt yellow gold square case, snap-in case back with side locking bars, crown marked, bar lugs, silvered dial, black graphics, applied Arabic numerals, seconds at six o'clock, hand-wound movement No. 911576, non-original brown leather strap, 18kt yellow gold buckle marked Patek Philippe, plastic crystal, gr. 35. Dim. mm 27x27