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Brand: | Valjoux | 
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|---|---|---|---|
| Family: |
Unknown
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| Height: | 1.70 mm | ||
| Jewels: | |||
| Reserve: | hours | ||
| Frequency: | 18,000 A/h, 36,000 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 44.00 mm (19.5 ligne) | ||
| Complications: | Chronograph, Monopusher Chronograph | ||
| Hands: | 15 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Ultra-Thin Hand-Winding Chronograph Ultra-Thin Hand-Winding  Hand-Winding  Balance Bridge |
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| Production: – | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 7720 was a 19.5 ligne stopwatch movement produced by Valjoux. The similar Cal. 7721 adds a central minute hand.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.