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| MST | 441, | 452 | | Ligne | 12''' | 12''' |
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 | | Cal. 452 |
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| Remarks: A stopgap movement produced to fill the need for an automatic with date while the MST436/437 was under development (the MST420 has no date option). MST filed a number of calendar mechanism patents during this time while they developed their own unique calendar mechanism design. The Felsa 4002/4007N base movement was modified and finely finished by MST, in particular: balance assembly, barrel and (possibly) the rotor. MST441 based on the Felsa 4002N, the MST452 based on the successor Felsa 4007N. MST452 production was only for a very short period, and used the same MST parts as the MST441. |
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| Production period: 1960-1963 (est) |
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| Jewels: | 23 | | Beat: | 18000 | | Winding: | automatic | | Manufacturer: | Other/Ebauche |
| | Hand sizes: | | Hour: | 150 | | Minute: | 90 | | Second: | 20/22 | | | | | Stem tap size: | 90 |
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| Variant: | | | MST 441 | 12''' (26mm) direct sweep seconds, date, Felsa 4002N | | MST 452 | 12''' (26mm) direct sweep seconds, quick date setting, Felsa 4007N |
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| Common parts/Interchange |
| Balance Staff: | | MST part number: | 723, | interchanges with MST: | none, Felsa 4002/4007 - please verify |
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| Mainspring: | | MST part number: | 770 (plus Felsa calibre) | interchanges with MST: | Felsa 4002/4007 | | Strength: | 0.1125 | | Height: | 1.40 | | Length: | 325 |
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