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date: set by changing 23-24h
11.5 / 12.75''', Dm=Do= 28.5mm
Dm= 25.6mm, Do= 26mm without dial mounting ring
f = 19800 A/h
power reserve 44h
Balance staff U2822
Mainspring / battery
1.20 x 10.0 x 0.105mm
1.50 x 0.90 x 0.18mm
Comments about the data
like 25-652, but balance with 3 instead 2 spokes, and bigger plate recess for lever cock
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
1975: Certina, 25-651M, Swiss Pat., 28 Jewels; Incabloc
(wrong calibre signature: "1M" engraved separately, but before finshing)
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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