|Diameter:||28.90 mm (13 ligne)|
|Complications:||2-Button, 5-Column Chronograph, 6-Column Chronograph, Chronograph, Column Wheel Chronograph, Monopusher Chronograph|
|Hands:||30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Small Seconds Hand at 9:00|
|Distinguishing Technical Characteristics|
Clockwise Balance Cock
|Production: 1923 –|
Cal. 20 CH is a 13 ligne chronograph movement produced by Minerva. It is officially called “Chonographe-Compteur 13/20 CH” on company data sheets. It was available as a monopusher (with 5 columns) or later as a a 2-pusher (with 6 columns). It was a compact movement suitable for use in wristwatches, though the small Minerva company never became a dominant player in the chronograph movement space.
Production began in the 1920s (perhaps 1923) and continued for decades.
The basic design of Cal. 20 CH was revised and reissued in the 2000s after the acquisition of Minerva by Montblanc.Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.