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| MST | 321, | 322 | | Ligne | 8.75 x 11.75''' | 8.75 x 11.75''' |
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 |  | | Cal. 322 | Cal. 322 |
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| Remarks: Large barrel movement for use in rectangular watches. One point of interest about the movement is the front click. The plain MST 321 has a combined barrel and centre bridge. The MST 322 is a dressed up version with what appears to be a seperate escape cock and train bridge (but isn't). However, the real joy is in the dummy ratchet and crown wheels, which are housed in a modified barrel bridge with geneva stripes. These wheels do rotate as the watch is wound, but are 100% redundant, with the winding function performed by the rocker bar mechanism on the front of the movement. The idea here is to make the movement appear upto-date, modern and better quality than it was. Inca block is listed as an option for this calibre - although I have never seen one. |
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| Production period: 1935 - |
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| Jewels: | 7, 15 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 130 | | Minute: | 60 | | Second: | 19 | | | | | Stem tap size: | 90 |
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| Variant: | | | MST 321 | 8.75 x 11.75''' (19.90 x 26.00mm) front click | | MST 322 | 8.75 x 11.75''' (19.90 x 26.00mm) front click, barrel bridge, dummy ratchet and crown wheels. |
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| Common parts/Interchange |
| Multiple balance staffs possible: | | MST part number: | 7423, | interchanges with MST: | 321, 322 | | MST part number: | 7423 (inca), | interchanges with MST: | 321, 322 |
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| Mainspring: | | MST part number: | 1221 | interchanges with MST: | 321, 322 | | Strength: | 1.175 | | Height: | 1.30 | | Length: | 280 |
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