| Brand: | Minerva | 
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|---|---|---|---|
| Family: |
Unknown
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| Height: | 6.7 mm | ||
| Jewels: | 6, 10 | ||
| Reserve: | hours | ||
| Frequency: | 18,000 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 39.95 mm (18 ligne) | ||
| Complications: | |||
| Hands: | Central Hour Hand, Central Minute Hand | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Counter-Clockwise Balance Cock |
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| Production: 1895 – 1941 | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 1 was an 18 ligne pin-set pocket watch movement produced by Robert Frères (later called Minerva) from about 1895 through the early 1940s. It was a basic movement with a cylinder escapement and was usually cased with an open face.
