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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

BM 13200 (Buren 1320)

Features
automatic
sweep second

Data
12.5''', Dm= 28.15mm, Do= 28.5mm
H= 2.85mm
(rotor +0.35mm)
F= 1.1mm
T= 1.4mm
30 jewels
f = 19800 A/h
power reserve 54h

Balance staff U3085

Stem W3060

Mainspring / battery
1.0 x 9.5 x 0.10mm

Hands
1.40 x 0.80 x 0.18mm

Comments about the data

Remarks
1962-
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.3)
indirectly driven minute and second allow a low profile
(details cf. Buren 1320)
since 1966/67 minor modifications of base plate (cf. Buren 1322)

family:
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
1) ca.1965: Baume & Mercier, Swiss, 30 Jewels; Incabloc
(BM 12820)
2) ca. 1965: Dugena, 1320, Swiss Made, 30 Jewels; Incabloc
(Dugena 1320, Buren 1320)

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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