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date: set by changing 23-24h
11.5''', Dm= 25.6mm, Do= 26.0mm
f = 19800 A/h
power reserve 46h
Balance staff U2822
Mainspring / battery
1.20 x 10.0 x 0.12mm
1.50 x 0.90 x 0.18mm
Comments about the data
like 25-661, but balance with 3 instead 2 spokes, and bigger plate recess for lever cock
choice between bevelled and plane date disc (cf. 25-651M)
As old and new components were mutually interchangable, they were arbtrarily mixed during the transition periode, and also the signatures were scarcely correct.
25-651: automatic, date
25-652: automatic, day, date
25-66: manual wind
25-661: manual wind, date
28800 A/h, ball bearing for minute staff:
25-671: automatic, date
25-672: automatic, day, date
28800 A/h, ball bearing plate redesigned:
25-681: automatic, date
25-682: automatic, day, date
Example, year: signature; shock device
ca. 1975: Certina, 25-661M, 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.
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