PATEK PHILIPPE REF. 1593 SO-CALLED HOUR GLASS DIAMOND INDEXES PLATINUM Patek Philippe, GenËve, No. 977519, case No. 2619990, Ref. 1593. Made circa 1958. Very fine and very rare, curved rectangular, flared, platinum wristwatch with an 18K white gold Patek Philippe buckle. Two-body, solid, polished and brushed, concave sides, shaped lugs, faceted crystal. Brushed silver with applied diamond indexes, subsidiary seconds dial. White gold feuille hands. Cal. 9```-90, tonneau-shaped, rhodium-plated, fausses cotes decoration, 18 jewels, straight-line lever escapement, Gyromax compensation balance, blued steel Breguet balance spring, micrometer regulator.