French 18 Carat gold lever chronograph with register Circa 1905

Gold chronograph with 60 minute register by Leroy & Cie
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A very rare, Swiss anti magnetic chronograph in chronometer quality, anchor chronometer Chronographe Ecran Paramagnétique, circa 1905.
Polished 18K gold “á goutte” case, signed dust cover, work bezel and dust cover made of iron, inscribed Ecran Paramagnétique. Signed enamel dial with Arabic radial hours, outer minutes/seconds track with five minutes/seconds numerals, subsidiary dial for the seconds, 60 minute counter, and gold pear hands. Signed precision lever movement with chronograph and counter, anchor chronometer quality.
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Diameter: 51 mm
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Weight: 100 g
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Signed: L. Leroy et Cie, Paris