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Brand: | Landeron | 
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|---|---|---|---|
| Family: |
Unknown
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| Height: | 6.22 mm | ||
| Jewels: | 17 | ||
| Reserve: | hours | ||
| Frequency: | 18,000 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 29.85 mm (13 ligne) | ||
| Complications: | 2-Button, 6-Column Chronograph, Chronograph, Column Wheel 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 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Clockwise Balance Cock  Screwed Balance  Indexed Regulator  6-Column Chronograph |
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| Production: – | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. 11 was a two-pusher column wheel chronograph movement produced by Landeron in the 1940s.
Dr. Ranfft suggests that Cal. 11 is a monopusher, but other sources suggest two pushers. Given that Cal. 11 has six columns to Cal. 13‘s five, it is likely that this is a two-pusher movement rather than one. Ranfft also suggests that it is “like 13, but weaker main spring” and that it was produced in the 1930s and 1940s.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.