Fine keyless Siderometre Breguet Type 101 split-seconds chronograph, Breguet No. 4107, produced in September 1938.
Breguet No. 4107, produced in September 1938, sold to the French Aeronautique on December 30, 1938, for 15'800 Francs. Fine keyless Siderometre Breguet Type 101 split-seconds chronograph, Brevete S.G.D.G., from a small series of 25 pieces only. C. Painted aluminium box, lined with felt insulation. Three fixing brackets are riveted to the outside. There is no case, the movement being fixed to the underside of the dial-plate, the latter engraved with operating indications. D. White enamel with outer seconds ring and three apertures for the digital degree indications. Blued steel counterpoised hand. M. 24Ó', high quality, blank by V. Piguet, 21 jewels, two with differential winding, one for the going train, the other for the motion works so that the going train can advance the numbered discs with minimal resistance. The motion work is very complex and carefully made. Straight line lever escapement, brass-invar "Integral" Guillaume balance, blued steel balance spring with terminal curve. Signed on the dial, the front plate and on the reverse of the bezel. Dim. 100 x 143 x 118 mm.
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