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electromechanically controlled balance motor
jumping sweep second
electrical and mechanical hack feature
13.5''', Dm= Do= 30.5mm
f = 21600 A/h
Balance staff Durowe 4731
Stem Durowe 24700
Mainspring / battery
1.30 x 0.80 x 0.20mm
Comments about the data
1961-1962 (continued as Timex M67)
first German electrical wrist-watch calibre
Movements of this kind are not self-starting. So when pulling the crown, the balance is locked in a position, from which it reliably starts when pushing the crown (Fig.3).
late samples with regulator pointer (Fig.4)
As Laco/Durowe was aquired by the U.S. Time Corporation (Timex) already in 1959, these movements were only shortly signed as Laco.
Example, year: signature; shock device
1-2) 1961: Laco, Durowe 861, West Germany, 11 Jewels; Duro-Swing
3-4) 1963: Timex, Durowe 861, U.S. Time Corp., West Germany, 11 Jewels; Duro-Swing
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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