Zenith 18.5''' 18-28, Balance staff, DCN: 42
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DCN no: 42 -
Fits cal: 18.5''' 18-28-3A, 18-28-3P
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A: 468 -
B: 229 -
F: 74 -
G: 123 -
H: 54
Versions with positive setting mechanism..
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18-28-3A: Breguet hair spring. -
18-28-3A-6: Pare-chocs. -
18-28-3P: Breguet hair spring. -
18-28-3P-6: Pare-chocs. -
18-28-3P-7: Breguet hair spring, swan neck regulator.
Versions with negative setting mechanism, nouveau
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18-28-1T: Lépine. -
18-28-3T: Lépine. -
18-28-2T: Savonette. -
18-28-4T: Savonette. -
19-28-1T: Lépine grandeur 19''' -
18-28-2T: Savonette grandeur 19'''
Versions with negative setting mechanism, ancien
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18.5''' NVS Bas VS: Lépine and savonette, no engraved cal. no.