Zenith 18.5''' 18-28, Winding stem, DCN: 1374

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  DCN no: 1374
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  Thread: 150
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  Fits cal: cal: 18.5''' 18-28-3A, 18-28-3P, 18-28-4T

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  A: = 88
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  B: = 119
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  C: = 180
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  D: = 150
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  F: = 710

Versions with positive setting mechanism..

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  18-28-3A: Breguet hair spring.
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  18-28-3A-6: Pare-chocs.
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  18-28-3P: Breguet hair spring.
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  18-28-3P-6: Pare-chocs.
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  18-28-3P-7: Breguet hair spring, swan neck regulator.

Versions with negative setting mechanism, nouveau

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  18-28-1T: Lépine.
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  18-28-3T: Lépine.
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  18-28-2T: Savonette.
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  18-28-4T: Savonette.
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  19-28-1T: Lépine grandeur 19'''
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  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.