MST 420 
Ligne12'''
Remarks: Meyer and Stuedeli SA (MST) second in-house automatic.
 
Production period: 1956-1962
Jewels: 17 0r 21
Beat: 18000
Winding: automatic
Manufacturer: MST
Hand sizes:
Hour:150
Minute: 90
Second: 20
  
Stem tap size: 90
Variant:
MST 420 12''' (26mm) direct sweep seconds
Common parts/Interchange
Balance Staff:
MST part number:7486,  interchanges with MST: none
Mainspring:
MST part number:1280 interchanges with MST: none
Strength: 0.1030
Height: 1.45
Length: 360

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