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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Gruen 270

manual wind

6.75 x 7.75''', Dm= 15.35 x 17.2mm
Do= 15.35 x 17.5mm
H= 3.4mm
F= 1.0mm
T= 1.5mm
17 jewels
f = 18000 A/h
power reserve 36h

Balance staff U1866

Stem W2165

Mainspring / battery
Zf649, 1.20 x 6.5 x 0.08 x 190mm
original: 1.18 x 6.5 x 0.08 x 200mm

0.95 x 0.50mm

Comments about the data

Breguet hairspring

flat haispring:
210: 17 jewels
210SS: 17 jewels, sweep second
211: 15 jewels
211SS: 15 jewels, sweep second
212: 7 jewels
Breguet hairspring, different crown mechanism:
215: 17 jewels
216: 15 jewels
215SS: 17 jewels, sweep second
216SS: 15 jewels, sweep second
suffix R: Incabloc
Breguet hairspring, different crown mechanism like 210...:
270: 17 jewels
270SS: 17 jewels, sweep second
271: 15 jewels
271SS: 15 jewels, sweep second
272: 7 jewels

Example, year: signature; shock device
ca. 1945: 1-51515, GXC, Gruen Watch Co, Conoruma, 17 Jewels
(Gruen 271SS, sweep second)

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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