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Fig. 2

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Fig. 3

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Fig. 4

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Fig. 5

ETA 1256

sweep second
option: power reserve display 40h

11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.85 / 6.9mm
F= 1.5 / 2.55mm
T= 2.0 / 3.05mm
(without / with power reserve display)
17/21/25 jewels
f = 18000 A/h
power reserve 40h

Balance staff U1397/U3098
balance with/without screws

Stem W2767 (W1161)
Occasionally for manual wind and automatic different stems are listed, but both are equal.

Mainspring / battery
Zf1211, 1.50 x 9.0 x 0.10 x 290mm

1.50 x 0.90 x 0.20mm

Comments about the data

1950-1954, 11760102 (1256...1259)
first automatic from ETA (Etarotor)
rotor-bearing clearance adjustable
option power reserve display (Indimatic)
differences not known between 1256, 1285, 1286

manual wind:
1080: 10.5''', H= 4.15mm
1081: 11.5''', H= 4.15mm
1093: 11.5''', date
1152: 10.5''', H= 4.5mm
1153: 11.5''', H= 4.5mm
1256: -
1258: date
automatic, minor modifications:
1257: -
1259: date

Example, year: signature; shock device
1-2) ca. 1950: Swiss Made, 21 Jewels; Incabloc
3-5) ca. 1950: MOG, M.A. Mead & Co, Indimatic, Swiss, 17 Jewels; Incabloc

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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