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
430 431 435 440 335
Fingerprint
(Movement Shape and Keyless works parts)
Page in Repairer's Reference: 226
Style Numbers Used Per Year
Marking variants
A Series Serial Number
B Series Serial Number
C Series Serial Number
Notes
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
