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| MST | 202, | 229, | 242, | 271, | 303, | 337, | 337sc | | Ligne | 10.5''' | 10.5''' | 10.5''' | 10.5''' | 10.5''' | 11.5''' | 11.5''' |
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 |  | | Cal. MST 229/242 | Cal. MST 229 |
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| Remarks: First calibre in the family was the MST 202, which was also the first 10.5 ligne Roamer lever movement. The 202 was obsolete by 1933 - possibly due to the need to develope a centre second version and it was replaced in both forms by the MST 229 sometime after 1933. All three MST 229 movements examined so far have used the MST 242 front plate. This family shares the balance, lever, escape, mainsping and many other parts with the MST253 and 277. The larger 337 calibre shares all the same components with larger base plate and bridges. |
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| Production period: 1925-1932 (202), 1934- (229), all others in production in 1933 - late 1930s |
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| Jewels: | 15 | | Beat: | 18000 | | Winding: | manual | | Manufacturer: | MST |
| | Hand sizes: | | Hour: | 150 | | Minute: | 80 | | Second: | 19 | | | | | Stem tap size: | 90 |
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| Variant: | | | MST 202 | 10.5''' (23.40mm) seperate escape cock | | MST 229 | 10.5''' (23.40mm) seperate escape cock | | MST 242 | 10.5''' (23.40mm) seperate escape cock, different train bridge. | | MST 271 | 10.5''' (23.40mm) false 3 finger train bridge | | MST 303 | 10.5''' (23.40mm) version of the 271 without the 3 finger train bridge | | MST 337 | 11.5''' (25.50mm) large version of the 229 | | MST 337sc | 11.5''' (25.50mm) large version of the 229 with centre seconds |
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| Common parts/Interchange |
| Balance Staff: | | MST part number: | 7438, | interchanges with MST: | 202, 229, 242, 253, 271, 277, 303, 337 |
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| Mainspring: | | MST part number: | 1232 | interchanges with MST: | 202, 229, 242, 253, 271, 277, 303, 337 | | Strength: | 1.050 | | Height: | 1.45 | | Length: | 250 |
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