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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

ETA 2660

Features
manual wind
sweep second
optional hack feature

Data
7.75''', Dm= 17.2mm, Do= 17.5mm
H= 3.5mm
F= 1.15mm
T= 1.75mm
17 jewels
f = 28800 A/h
power reserve 45h

Balance staff U3519

Stem W3409

Mainspring / battery
1.32 x 7.0 x 0.077 x 320mm

Hands
1.20 x 0.70 x 0.20mm

Comments about the data

Remarks
1971-2010

family:
21600 / 28800 A/h respectively:
7.75''':
2640/2660: manual wind
2641/2661: manual, date
2648/2668: manual, day/date
2650/2670: automatic
2651/2671: auto, date
- / 2675: auto, date, moon-phase
2658/2678: auto, day/date
8.75''':
- / 2681: auto, date, 28800 A/h
- / 2685: auto, date, moon-phase, 28800 A/h
2688 / - : auto, day/date, 21600 A/h
2691 / - : manual, date, 21600 A/h

Example, year: signature; shock device
1-2) ca. 1975: MST 489, Roamer Watch Co, Swiss, 17 Jewels; Incabloc
(MST 489, ETA 2660)
3) ca. 1975: Eterna, Swiss - Patented; Kif-Ultraflex
(Eterna 12660B)

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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