MST 202,  229,  242,  271,  303,  337,  337sc 
Ligne10.5''' 10.5''' 10.5''' 10.5''' 10.5''' 11.5''' 11.5'''
Cal. MST 229/242 Cal. MST 229

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.
 
Production period: 1925-1932 (202), 1934- (229), all others in production in 1933 - late 1930s

Jewels: 15
Beat: 18000
Winding: manual
Manufacturer: MST
Hand sizes:
Hour:150
Minute: 80
Second: 19
  
Stem tap size: 90

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

Common parts/Interchange
Balance Staff:
MST part number:7438,  interchanges with MST: 202, 229, 242, 253, 271, 277, 303, 337
Mainspring:
MST part number:1232 interchanges with MST: 202, 229, 242, 253, 271, 277, 303, 337
Strength: 1.050
Height: 1.45
Length: 250

All text and images are either © Kris Bubendorfer 2011-15 or © Roamer Watch Company.