Important Collectors’ Wristwatches, P...

Geneva, Mandarin Oriental Hotel Du Rhône, May 13, 2007

LOT 629

?Ecran Paramagnetique? L. Leroy & Cie. A Paris, 7 Boulevard de la Madeleine, No. 69774. Made circa 1900. Very fine, rare and unusual, 18K gold, keyless dress watch with chronograph, instantaneous 60-minute register and special ?antimagnetic? double case.

C. Three body, "bassine", polished, the back engraved with a monogram, inner soft iron case forming an antimagnetic shield. D. White enamel with radial Roman numerals, inner red Arabic 13-24, outer minutes and fifths of a second track, outermost tachymeter scale, subsidiary seconds at 6 and 60-minute register at 12. Gold ?Spade? hands. M. 19"', gilt brass, 23 jewels, straight line lever escapement, bimetallic compensation balance cut in the middle of the rim, blued steel Breguet balance spring, index regulator, chronograph with visible work, activated by a button in the winding-crown. Dial, cuvette and movement signed. Diam. 51 mm.