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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

Buren 546A

sweep second
power reserve display 2...38h, limited by banking pin
This range of 36h covers actually only a run time of 34h, is thus a bit exaggerated.

11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.35mm
power-reserve hand +0.8mm)
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

1.25 x 0.70 x 0.25mm

Comments about the data

jewel-bearing rotor if 23 jewels
detached manual wind
ingeniously simple power reserve display: The rotation of the barrel arbor is transfered to the hand, and the rotation of the barrel with the same gear ratio to the tiny dial (Fig.3). Thus even without a complicated differential gear the difference of the arbor rotation (winding) and the barrel rotation (run down) is displayed.

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 *)
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
ca. 1955: RXG, C.546, 11 1/2-546A, Olympic, R. Gsell & Co. Inc., Swiss, 23 Jewels - BAA; 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

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