French historically important chronograph watch Circa 1885

Gold lever with single button chronograph
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Very heavy Louis XV single button chronograph with high grade movement by Guinand Mayer  Les Brenets, circa 1885.
An 18 carat pink gold, gold monogram, very heavy and high quality case with lateral hinge, exquisite à goutte case, Ankerchronometer movement, prime quality with special lever, solid golden gear and highly polished chronograph parts, in contrast to the blued steel screws, undamaged preserved enamel dial, decorative pink golden hands,roman numerals, subsidiary dial, very nice condition of preservation, fine collector’s watch.
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Diameter: 55 mm
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Weight: 138 g
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Signed:  Guinand Mayer   Les Brenets