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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Durowe 861

electromechanically controlled balance motor
back crown
jumping sweep second
electrical and mechanical hack feature

13.5''', Dm= Do= 30.5mm
H= 6.05mm
11/12 jewels
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
(Timex M67)

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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