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| MST | 264, | 296 | | Ligne | 12''' | 12''' |
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 |  |  | | Cal. 264 (c) David/Mirius | Cal. 264 early barrel bridge (c) David/Mirius | Cal. 264 later barrel bridge and shock resist |
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| Remarks: This appears to be the first calibre for which Roamer experimented with shock-resist. This movement (and others) were also later available with incaloc. The three finger bridge on the MST 264 movement is real, unlike the later 352 and 364 calibres. Being the only 12''' Roamer calibres, the 264 and 296 share few parts with others, clickspring and click aside. The 296 is a later version of the calibre with only a single train bridge which is much cheaper to manufacture compared to the separate fingers, each of which needs a screw and a location pin. The movement itself is very well finished and reinforces MSTs dedication continual improvement. It seems likely this movement would have replaced the 13''' MST 175. It also seems likely that this movement would have been replaced by the 11.5''' MST 364. The date range given below is based on this reasoning. |
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| Production period: 1927 - 1938 |
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| Jewels: | 15 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 150 | | Minute: | 80 | | Second: | 19 | | | | | Stem tap size: | 120 |
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| Variant: | | | MST 264 | 12''' (26.70mm) sub second, three finger train bridge | | MST 296 | 12''' (26.70mm) sub second, single train bridge |
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| Common parts/Interchange |
| Multiple balance staffs possible: | | MST part number: | 7447, | interchanges with MST: | 264, 296 | | MST part number: | 7448 (inca), | interchanges with MST: | 264, 296 | | MST part number: | 7449 (SR), | interchanges with MST: | 264, 296 |
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| Mainspring: | | MST part number: | 1235 | interchanges with MST: | 264, 296 | | Strength: | 1.200 | | Height: | 1.75 | | Length: | 300 |
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| Watches in my collection with the MST264: |
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