Cronometer discount serial#
Absolute record and serial prize for the 4 best timepieces from the same manufacturer.Ĭase: two-body wooden protective/testing case, circular case, polished bezel, glazed transparent display back, large crown. In 1967, Calibre 5011O was the most accurate movement ever tested to date by the Neuchâtel Observatory. It was also used in the Pilot Montre d’Aéronef Type 20 in limited quantities (from about 350 unused movements). In 1960, the large 50mm Calibre 5011 set a record-breaking precision standard in its category and was used to power marine chronometers, pocket watches and table clocks.
Moreover it’s very unusual, that the Guillaume balance is hand-signed by Jean-Pierre Vuille with “JPV” initials. To reduce the friction, 48-hour power reserve indication is not functional, corresponding functionality was removed by adjuster, during preparation for the trials. Made in 1967 exclusively for observatory competitions, that particular piece got “Primes” (11th place of around 180 participants in the category, with score 2.44) at the observatory competition in Neuchâtel in 1967 thanks to Jean-Pierre Vuille, who adjusted this movement for the trials at Zenith. 5011 O ( «O» stands for Observatory, 50mm, 22 lines, high frequency 21’600 alt/hour, Guillaume balance), comes with its original testing wooden housing. Extremely rare and well-preserved fine ZENITH Observatory Competition chronometer SN.
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