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Fig. 1

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Fig. 2

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Fig. 3

Hamilton 661 (Certina 25-45)

Features
automatic
sweep second

Data
11.5''', Dm= 25.6mm
H= 6.0mm
17 jewels
f = 18000 A/h
power reserve 42h

Balance staff U2207

Stem W2306

Mainspring / battery
1.25 x 9.5 x 0.10mm

Hands
1.50 x 0.90 x 0.18mm

Comments about the data

Remarks
1951-1960 (Certina)
selfwinding gear from beryllium bronze

family:
661: -
690: date

Example, year: signature; shock device
1957: Certina, Swiss Made, 23 Jewels, Patents+; Incabloc
(Certina 25-45)

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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