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View picture in original size
Fig. 1

Gruen 425SS

manual wind
sweep second

10.5 x 10.5''', Dm= 23.4 x 23.4mm
H= 4.85mm
T= 2.5mm
17 jewels
f = 18000 A/h
power reserve 40h

Balance staff U1736

Stem W2075

Mainspring / battery
1.15 x 9.0 x 0.11 x 250mm
~Zf582, 1.15 x 9.0 x 0.10 x 290mm

1.22 x 0.66 x 0.22mm

Comments about the data

Breguet hairspring
stem mechanism without setting-lever spring

respectively 17/15 jewels
405/406: 10.5 x 11.5''', sub second
405SS/406SS: 10.5 x 11.5''', sweep second
410/411: 10.5''', sub second
410SS/411SS: 10.5''', sweep second
420/421: 11.5''', sub second
420SS/421SS: 11.5''', sweep second
425/426: 10.5 x 10.5''', sub second
425SS/426SS: 10.5 x 10.5''', sweep second
suffix C: curved dial side

Example, year: signature; shock device
ca. 1945: 337616, Gruen Watch Co, Switzerland, Conoruma, Veri-Thin Patented, 15 Jewels
(Gruen 406SS, 10.5 x 11.5''')

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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