Pink Pages
for Timepieces
All Items
Ranfft Items
Brand Shops
Commit an Item
How to do right
Condition of Watches
About Watches
  Help   Log In  Register, Clients   Deutsch  English  EUR  US$  CHF  UKŁ 
 Index  Timepiece Archive, Categories  Archive: Watch Movements    Timepiece Market 
View picture in original size
Fig. 1

View picture in original size
Fig. 2

Gruen 355C

manual wind
sub second

7.75 x 11.75''', Dm= 17.65 x 26.4mm
H= 3.95mm
15 jewels
f = 18000 A/h
power reserve 40h

Balance staff U2415

Stem W2162

Mainspring / battery
1.18 x 8.5 x 0.105 x 250mm
~Zf665, 1.20 x 8.5 x 0.095 x 265mm

1.22 x 0.66 / 0.16mm

Comments about the data

Breguet hairspring
to wide extent like 500, but optimized for curved models
Conoruma is Gruen's proprietary alloy for hairspring and balance with low temperature dependence

311: Curvex, curved back surface
355: flat dial surface, plane back surface
355C: curved dial surfce, plane back surface

Example, year: signature; shock device
1937: 328811, 500, Gruen Watch Co, Switzerland, Coronuma Hrsp. & Bal., 15 Jewels
(Gruen 501 signed as 500)

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

bidfun home
...the alternative - free of charge!
Dr. Roland Ranfft
Poststr. 32a
26388 Wilhelmshaven
phone +49 (0)4423 9849691

email: info@ranfft.de