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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.
9.25''', Dm= 20.7mm, Do= 21.0mm
power-reserve hand +0.8mm)
f = 18000 A/h
Balance staff U2503
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
1-2) 1962: old data sheet
3) Buren 546A, 11.5'''
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.
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