HomeRanfft
Watches
Pink Pages
for Timepieces
.
Home
All Items
Ranfft Items
Brand Shops
Commit an Item
How to do right
Condition of Watches
About Watches
Links
  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

View picture in original size
Fig. 3

View picture in original size
Fig. 4

View picture in original size
Fig. 5

View picture in original size
Fig. 6

Revue 31 open face

Features
stem wind and set
sub second

Data
19''' / 16 size, Dm= 41.85mm, Do= 42.95mm
H= 6.6mm
F= 0.5mm
T= 2.6mm
7/15/16 jewels
f = 18000 A/h
power reserve 34h

Balance staff U312, Ronda 2406
balance collet 1.45mm
Ronda lists also the Ronda 4603 with 1.25mm, but this is likely so easy to get because nobody needs it.

Stem
movement section W1620
pendant section W1779, W1780

Mainspring / battery
2.80 x 17.0 x 0.18mm

Hands
1.80 x 1.10 / 0.26mm

Comments about the data

Remarks
open face calibre
different bridge shapes (cf. also Revue 30 open face)
negative stem mechanism
lever cock and banking pins (examples) or lever bridge with fixed banking (cf. Revue 30)
options:
Breguet hairspring (Fig.3, 5)
bimetallic screw balance (Fig.3)
cam disc regulator (Fig.3)

Example, year: signature; shock device
1-2) 1926: VWC (Vertex Watch Co.), Swiss Made, 7 Jewels - 855
3-4) ca. 1925: Prima, Swiss Made - 860
5-6) 1950: J.W. Benson, 62 & 64 Ludgate Hill, London, By. Warrant to H.M. the Late Queen Victoria, Swiss Made
(despite referring to Queen Victoria: 1950 is correct)

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
Germany
phone +49 (0)4423 9849691

email: info@ranfft.de
.