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 Fig. 1  Fig. 2  Fig. 3 | Buren 544 Features automatic sub 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. Data 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 Hands 1.25 x 0.70mm Comments about the data | Remarks 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. 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 ca. 1955: RXG, C.546, 11 1/2-546A, Olympic, R. Gsell & Co. Inc., Swiss, 23 Jewels - BAA; Incabloc (Buren 546A) 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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