| Brand: | Valjoux | 
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| Family: |
Unknown
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| Height: | 7.70 mm | ||
| Jewels: | |||
| Reserve: | hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 31.00 mm (14 ligne) | ||
| Complications: | 2-Button, Cam Switching Chronograph, Chronograph, Date, Hand Winding, Quick Date Correction | ||
| Hands: | 12 Hour Chronograph Hand at 9:00, 30 Minute Chronograph Hand at 3:00, Central 60 Second Chronograph Hand, Central Hour Hand, Central Minute Hand, Date Window at 4:30, Small Seconds Hand at 6:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Clockwise Balance Cock |
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| Production: – | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 7740 is a cam-operated chronograph movement with 30 minute and 12 hour counters and date. The similar Cal. 7741 adds a central 24 hour (GMT) hand.