ETA 900 WATCH STEMS

Remarks
option: Breguet hairspring, standard flat hairspring
differences not known between 900, 902, 903, 927-929, 938, 941, 968
likely just different bridge designs (cf. Fig.5)

family:
900: 10.5''', sub second
901: 10.5''', sweep second
930: 11.5''', sub second
932: 11.5''', sweep second

Example, year: signature; shock device
1-2) ca. 1950: Eska Watch Co, Swiss, 17 Jewels - KU
(Standard)
3-4) ca. 1950: Eska Watch Co, Swiss, 17 Jewels
(Breguet hairspring)
5) ca. 1950: 12062, EON, Avalon Watch Co, Swiss, 17 Jewels - ETA
(special balance with 10 adustable weights not known from ETA)

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