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| ETA 900 Features manual wind sub second Data 10.5''', Dm= 23.35mm H= 3.5mm 17/18 jewels f = 18000 A/h power reserve 48h | Remarks option: Breguet hairspring, standard flat hairspring differences not known between 900, 902, 903, 927-929, 938, 941, 968 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) 1-3) ca. 1950: Eska Watch Co, Swiss, 17 Jewels (Breguet hairspring) |
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