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| Remarks: A completely original alarm calibre, features 2 barrels - main and alarm, both wound from the same crown. Similar in design to the Vulcain Cricket in that it uses a crown wheel rocker to switch between barrels depending on direction crown is wound. Roamer took out patents relating to the design of the special sounding back. This is the first version of the Alarm calibre, and is rarer than the modified MST 427 that replaced it. |
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| Production period: 1952-1955 |
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| Jewels: | 17 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 150 | | Minute: | 90 | | Second: | 19 | | 4th hand: | 220 | | | | | Stem tap size: | N/A |
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| Variant: | | | MST 417 | 12''' (27mm) Alarm |
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| Common parts/Interchange |
| Balance Staff: | | MST part number: | 7480, | interchanges with MST: | 427 |
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| Multiple mainsprings possible: | | MST part number: | 1270 (Main) | interchanges with MST: | 427 | | Strength: | 0.1100 | | Height: | 130 | | Length: | 345 | | MST part number: | 1271 (Alarm) | interchanges with MST: | Nil | | Strength: | 0.825 | | Height: | 200 | | Length: | 320 |
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| Associated Patents: |
| CH295436 | Alarm hammer mechanism | | Deposited 1951, granted 1953 |
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| Watches in my collection with the MST417: |
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