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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Buren 547

Features
automatic
sweep second

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.35mm
F= 1.2mm
T= 1.4mm
17/23 jewels
f = 18000 A/h
power-reserve 36h

Balance staff U2503

Stem W2536

Mainspring / battery
Zf1012, 1.40 x 7.5 x 0.07 x 280mm

Hands
1.25 x 0.70 x 0.25mm

Comments about the data

Remarks
jewel-bearing rotor if 23 jewels
detached manual wind
differences not known between 542, 547, 549

family/generations:
9.25''':
535: sub second
536: sweep second
537: sweep second *)
538: power reserve display, sub second
539: power reserve display, sweep second
540: power reserve display, sweep second *)
11.5''':
541: sub second
542, 547, 549: sweep second
543: sweep second *)
544: power reserve display, sub second
545: power reserve display, sweep second
546: power reserve display, sweep second *)
suffix A: for strongly domed dial
*) Many catalogs mention here a direct sweep second instead of an indirect. But the investigated 546A has definitely an indirect sweep second.

Example, year: signature; shock device
1962: old data sheet

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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