• Case: 18kt yellow gold, rectangular “Hour Glass” shape, approx. 41 × 25 mm
• Strap: brown leather with original yellow gold buckle
• Movement: manual winding caliber 9‑90 (18 jewels, Gyromax balance, ~40h power reserve)
• Dial: argenté with applied indexes and Arabic numerals at 3, 9, and 12 o’clock, small seconds at 6
• Crystal: domed plexiglass
• Reference: 1593
• Year of production: 1950s (circa 1949–1955)
• Condition: excellent, original case, movement, and dial

Key Features

• Iconic “Hour Glass” design with concave and convex sides, case made by Markowski, typical of the 1950s
• Caliber 9‑90 movement with Gyromax balance, a hallmark of Patek Philippe precision and finishing
• Rare production: approx. 1,000 pieces in total, about 500 in yellow gold

Context & Collectibility

Reference 1593, nicknamed “Hour Glass”, was produced from 1944 to the early 1960s. It is now highly sought after for its bold design and rarity.

Useful links:
Official Patek Philippe website
General overview on Calatrava