LoupeLabZenith 135-O
Zenith · Automatic · Found in 3 watches
135-O description Developed from 1945 onwards by Ephrem Jobin, the Calibre 135 was produced from 1949 until 1962 in two distinct versions: a commercial variant, and a second iteration made solely for taking part in chronometry competitions at the Observatories of Neuchâtel, Geneva, Kew Teddington, and Besançon. These "O" movements, which were never commercialized nor cased in wrist or pocket watches, underwent exhaustive testing through drastically different temperatures, shocks and running in 6 different positions, consistently delivered optimal chronometric performance with minimal variations in rate.
TypeAutomatic
Jewels19
Frequency18,000vph
Power Reserve40hrs
Diameter29.32mm
Specifications
TypeAutomatic
Jewels19
Frequency18,000 bph
Power Reserve40 hours
Diameter29.32 mm
Height--
Accuracy--
Lift Angle--
Complications
hoursminutessmall seconds
Also Known As
135-OCaliberCal. 135-OCaliber
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Watches Using This Caliber(3)
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