French silver centre seconds cylinder with calendar Circa 1800

Silver cylinder watch with centre seconds and calendar by Charles Le Roy
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A very fine and rare French silver centre seconds cylinder pocket watch with calendar, circa 1800. Frosted gilt movement, conical pillars, fusee and chain, cylinder escapement, three armed brass balance, flat balance spring, pierced and chased continental balance cock, silver regulation dial.  White enamel dial, regulator type, small mean time dial in the lower half of the dial with Arabic numerals and outer dot minute divisions, concentric date and day of the week dial in the upper half, outer seconds divisions, original gold lozenge hour and minute hands, steel seconds hands.  Polished case, inclined bezel. Dial and movement signed.
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Diameter: 56 mm
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Signed: Charles Le Roy à Paris
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Le Roy, a watchmaking dynasty founded by Bazile-Charles Le Roy, whose father, Bazile Le Roy, was himself a fine watchmaker. Bazile-Charles Le Roy settled in the Palais Royal in 1788, first at 88, Galerie de Pierre, then at 13-15 of the same Galerie. He signed Le Roy, Palais Royal, or Le Roy, Galerie Egalité. Under the Reign of Terror, Le Roy adopted the anagram Eylor, only resuming his real name after the Revolution. During the First Empire, Le Roy supplied watches and clocks to the Imperial family and in 1806 was appointed Clockmaker to Madame Mère, the Emperor’s mother. He then signed Le Roy, Hgr de S A I & R (Son Altesse Impériale et Royale), Madame Mère de l’Empereur et Roi.