MST 175 
Ligne13'''

Remarks: The 13 ligne MST 175 was the first ROAMER wrist watch calibre , featured a jeweled Swiss lever, three finger train bridge and later a non-magnetic hairspring. The 175 was a cut above the other small contemporary MST production calibres, and many later calibres, 264, 352, and the 364 bear a striking family resemblance - so in many ways the MST 175 is the grandfather of designs in use until the late 1960s. The MST 175 was introduced in 1918 (confirmed by case hallmarks) and it would appear it was superceeded by the 264 in 1928. Few parts are interchangeable with other MST calibres.
 
Interestingly non-magnetic versions of the MST 175 were produced from 1927, debunking the Tissot claim for the first non-magnetic wrist watch in 1929.
 
Production period: 1918-28

Jewels: 6, 7, 13 or 15
Beat: 18000
Winding: manual
Manufacturer: MST
Hand sizes:
Hour:150
Minute: 90
Second: 19
  
Stem tap size: 120

Variant:
MST 175 13''' (28.9mm) sub second, 3 finger bridge

Common parts/Interchange
Balance Staff:
MST part number:7453,  interchanges with MST: none
Mainspring:
MST part number:1240 interchanges with MST: none
Strength: 0.1375
Height: 1.60
Length: 300
Watches in my collection with the MST175:

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