MST 321,  322 
Ligne8.75 x 11.75''' 8.75 x 11.75'''
Cal. 322 Cal. 322

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.
 
Production period: 1935 -

Jewels: 7, 15
Beat: 18000
Winding: manual
Manufacturer: MST
Hand sizes:
Hour:130
Minute: 60
Second: 19
  
Stem tap size: 90

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.

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
Mainspring:
MST part number:1221 interchanges with MST: 321, 322
Strength: 1.175
Height: 1.30
Length: 280

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