A double-faced pocket watch with triple complication, signed on the enamel dial PATEK, PHILIPPE & CIE GENEVA, SWITZERLAND, made in 1914/15. The keyless-winding and setting pocket watch, featuring mean time (on the first dial, concentric hours and minutes, and a subsidiary seconds dial at 6 o’clock) has the following nine horological complications. On the main dial 1/5 seconds chronograph (released by the round push-piece located on the winding-crown); safety bolt locking the chronograph’s functions (slide at 11 o’clock); split-seconds (released by the rectangular push-piece located on the case-band at 10:30); and a 30-minute recorder (subsidiary dial at 12 o’clock): the dial on the other side has instantaneous perpetual calendar, date of the month (subsidiary dial at 6 o’clock); day of the week (subsidiary dial at 9 o’clock;); month of the year (subsidiary dial at 3 o’clock; age and phases of the moon (subsidiary dial, graduated from 0 to 29 ½, and aperture at 12 o’clock), all indications in English. Finely the watch has a minute-repeater on two gongs (released by the slide located on the case-band, on the left side of the pendant). The case is made in yellow gold, a so-called round bassine, double-face, lunettes larges-shaped; engine-turned case band and bezels. The main white enamel has black painted suspended Breguet numerals and blued steel poire (pear-shaped) hands; blued steel counter balanced seconds-hand. The white enamel dial on the other side has blued steel hands. The 19’’’ movement is rhodium plated, with straight-line equilibrated lever escapement, compensated balance and blued steel balance spring with terminal curve (18,000 vibrations per hour). • Diameter: 52 mm. • The makers, Antoni Patek, who originally came from Poland, and Frenchman Adrien Philippe, the inventor of the keyless winding mechanism, joined forces in 1851. The company, Patek Philippe & Co is still one of the leading watchmaking companies in Geneva today.