Unique extra large, 18ct. gold, keyless minute repeating "Grand and Petite sonnrie" moon phase astronomical clock watch with perpetual calendar, split seconds chronograph with 30 minute instantaneous recorder and alarm, with power reserve indicators for both the going and the striking trains.

CASE: Four body massive, "pomme et grande gouge", polished. Gold cuvette. 

DIAL: Gold frosted and gilt with Breguet numerals, outer chronograph ring, subsidiary dials for days of the week with inner 30 hour striking train up and down scale, minute register with sunk inner leap year cycle  , the month with inner 30 hour going train up-and -down scale, the dates with inner moon phase aperture and running seconds. Blued steel "spade" hands. 

MOVEMENT: 23''', rhodium plated "fausses cotes" decoration, three trains with differential winding, the alarm train wound by means of a slide in the band, 55 jewels, straight line lever escapement, brass invar Guillaume balance, Breguet balance spring with special micrometic index, Swiss patent  No. 101562. Striking and repeating on gongs, the repeating dented in the band, "Grand /Petite sonnrie" and Strike/Silent" nibs in the band. Split seconds chronograph with visible work, button on the winding crown and push piece in the band. Signed on the dial, case and movement.

Previously in the collection of His Majesty King Farouk of Egypt, this watch was sold in March 1954 in the Cairo Sale of the Palace Collection, lot No. 450.

This unique watch is illustrated in l'Univers de Vacheron Constantin, Geneve, p.400. It is also illustrated, much enlarged, in the same book p.274 and its movement p.275-279.