Size (lignes): 8 3/4 "' x 9 3/4 "'
Jewels: 17
Year Introduced: 1940
Mainspring Size in mm
1.18 x .105 x 247
Mainspring Interchangeability
Mainspring Interchangeability
430 431 435 440 335
Fingerprint
(Movement Shape and Keyless works parts)
Page in Repairer's Reference: 225
Style Numbers Used Per Year
Marking variants
B Series Serial Number
Notes
Almost entirely interchangeable with the Curvex 440 movement.
Is the "Precision" 17 jewel version of the Veri-Thin 430 family of movements consisting of 430, 431, 435
Gruen states that the 440 Curvex uses the same parts as the 430 except for Ratchet Wheel, however that's a gross summary. Closer examination shows these differences
- The ratchet wheel's text (mechanically they are the same)
- The pillar plate has differing caliber stamps
- The pillar plate on the 440 is "curved"
- The ratchet bridge with the serial number
- The train bridge has different text and design but mechanically the same