■SPECIFICATIONS
Cal. number | 9S51 | 9S55 | 9S56 |
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1. | Time indi- | 3 hands | 3 hands | 4 hands |
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| cation | (hour, minute and | (hour, minute and second) |
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| second) | with date | with date |
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2. | Vibrations |
| 28,800/h |
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3. | Driving system |
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4. | Jewels | 24 jewels | 26 jewels | 27 jewels | 29 |
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