French gold 1st classe chronometer watch with 24-hour dial Circa 1910

Prime quality gold chronometer watch 
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A very fine French, 18K yellow gold, keyless pocket lever chronometer with Guillaume balance, circa 1910. Obtained First Class rating at Besançon Observatory timing contest. Bulletin 1st Classe Chronometer with 24-Hour Dial by L. Leroy & Cie, Horlogers de la Marine, 7 Bd. de la Madeleine, Paris, “Bulletin de 1ere Classe”.
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A polished case, concealed hinge. Hinged gold cuvette engraved with the chronometer trial details. White enamel dial with Arabic numerals and inner 24-hour numerals, outer minute track, subsidiary seconds dial. Gold spade hands. A matte gilt movement, stamped with the Besançon viper’s head mark, 17 jewels, straight-line lever escapement, Anibal brass Guillaume balance, blued steel Breguet balance spring, index regulator. Dial, case, cuvette and movement signed.
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Diameter: 50 mm
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Signed: L. Leroy & Cie  Paris
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The punch mark in form of a viper’s head is applied by the Observatory of Besançon on watches that were successful at the timing contest and received the Bulletin de Première class.