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| MST | 346 | | Ligne | 8.75 x 11.75''' |
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 | | Cal. 327 |
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| Remarks: Large barrel movement for use in rectangular watches. Watches with this calibre are of quite wearable size. This calibre is a vastly higher quality replacement for the MST 321, 322 calibres. No form of shock protection is listed in the factory manual, however one sample has come to light with single axis shock protection in a sturdy retangular case with gaskets. |
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| Production period: 1940s |
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| Jewels: | 17 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 130 | | Minute: | 60 | | Second: | 19 | | | | | Stem tap size: | 90 |
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| Variant: | | | MST 346 | 8.75 x 11.75''' (19.90 x 26.40mm) large rectangular, sub second |
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| Common parts/Interchange |
| Balance Staff: | | MST part number: | 7425, | interchanges with MST: | nil |
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| Mainspring: | | MST part number: | 1224 | interchanges with MST: | nil | | Strength: | 1.100 | | Height: | 1.20 | | Length: | 280 |
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