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OMEGA Observatory Chronometer, Cal. 30 DP

CHF 4,500


Rare and well-preserved fine OMEGA Observatory Competition chronometer SN. 9392907, Cal. 30mm DP (Guillaume balance, high frequency 25200 A/h) in its original testing housing No.73. Made circa 1940s exclusively for observatory competitions, that particular piece scored 10! (1944, 1948, 1950, 1951, 1952, 1953, 1957 and 1958) years successful participation at the observatory competitions in Geneva & Neuchâtel thanks to Joseph Ory and Gottlob Ith who regulated chronometers for trials. Moreover got “1er Prix” in Neuchâtel Observatory in 1950 and 1958, “3em Prix” in 1953. See results on the photo.

C. circular outer case, all set within an aluminium observatory testing box. D. White enamel dial, Breguet numerals, subsidiary seconds, steel blued hands. M. Cal. 30mm DP nickel-finished, 17 jewels lever movement, Guillaume balance with gold poising screws, oversized barrel, 25,200 A/h.

Up until 1967, the exact length of a second was determined by the Earth’s motion around the sun, and the Neuchatel observatory’s precise optics allowed the fine measurements necessary for precise timesetting to be made. Because of this, Neuchatel began to host observatory chronometer trials – a series of the most stringent, thorough accuracy tests in the history of mechanical watchmaking. The trials, held over a period of forty-five days, encompassed ten separate movement timekeeping tests in five different positions and two temperatures. These observatory trials quickly outgrew their roots as a simple certification test, and before long the trials at Neuchatel were a competitive battleground for the finest watchmakers in Europe. Names like Longines, Zenith, Peseux, Omega and many more traded records for decades, fighting to produce the most accurate movement possible. These movements were never intended for regular use, and bore little to no resemblance to what these companies offered their consumers. Along with the technical prowess of the watchmakers building the movements, in the “racing team” there were specialists, the “regleurs de precision”, who worked tweaking a number of movements until they could find a few of them to bring to the Observatory Competitions. By means of fine adjustments, replacement of key parts, use of special lubricants, they could create a few movements for the Competitions. And often they were the same movements for many years.

Watch is in overall very good condition (7/10), running and ready to use!


Brand Omega
Model Observatory Competition Chronometer
Year Circa 1940s
Movement Hand-winding
Calibre Omega Cal. 30 DP, f 25,200 A/h
Case material Steel & Aluminium
Case size 50 x 45 x 24 mm
Features chronometer
Box/Papers original testing housing


In fully working order (still accurate). Very good condition, minor surface scratches, scuffs and discolorations through the age. Hairline on the dial between 11h and 12h. Original aluminium testing case No. 73.

Watches are sold as-is, and there is no guarantee of to be waterproof or movement accuracy, due to the nature of vintage watches. Please view all the pictures carefully as they form an integral part of the description. Any defects not mentioned but visible in the pictures will be considered as described.


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