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

BM 12820 (Buren 1282)

date: set by changing 23-24h
since ca. 1966/67 changing 22-24h

12.5''', Dm= 28.15mm, Do= 28.55mm
H= 3.25mm
F= 1.6mm
T= 1.8mm
30 jewels
f = 19800 A/h
power reserve 54h

Balance staff U3085

Stem W3060

Mainspring / battery
1.0 x 9.5 x 0.10mm

1.40 x 0.80mm

Comments about the data

micro rotor, double jewel bearing
double excenter regulator for curb pins and stud carrier
selfwinding gear with direction switching by a pinion floating between two huge jewels (Fig.2)
indirectly driven minute allows a low profile
(details cf. Buren 1320)
since 1966/67 minor modifications of base plate and simplified date driver (cf. Buren 1322)

12800: only hour, minute
12810: date for flat dial
12820: date for domed dial
13200: second
13210: second, date for flat dial
13220: second, date for domed dial
The assignment of flat/domed dial is based on few investigated Buren watches. Possibly Buren didn't sign carefully, since the Flume K3 mentions it vice versa.

Example, year: signature; shock device
ca.1965: Baume & Mercier, Swiss, 30 Jewels; Incabloc

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