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Fig. 1

Buren 12 Chronomatic (Buren 1281)

automatic chronograph, 60s, 30min, 12h, cam switched
date: set by changing 21-24h

13.75''', Dm= 31mm
H= 7.7mm
17 jewels
f = 21600 A/h
power reserve 42h

Balance staff U3426

Stem W3398

Mainspring / battery
1.60 x 10.5 x 0.105mm

Comments about the data

joint development of Hamilton-Buren, Breitling and Heuer
module Dubois-Depraz 8510 on modified Buren 1281
crown at 9h
micro rotor
double excenter regulator for curb pins and stud carrier
indirectly driven minute allows a low profile
(details cf. Buren 1320)

11: 19800 A/h
12: 21600 A/h
14: as 12, with 24h-GMT
15: sub second instead of 12h-counter

Example, year: signature; shock device
1969: Heuer Cal.12, Swiss, 17 Jewels; Incabloc
(Heuer 12)

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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