Swiss rose gold verge watch with calendar dial Circa 1820

Gold calendar watch by Robert et Courvoisier 
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An elegant Swiss 14 carat rose gold open faced verge pocket watch with a calendar dial, circa 1820. Full plate movement, chain and fusee, verge escapement, three-arm brass balance. White enamel dial, time indication at 6 0’clock with gold Arabic hours on a blue enamel chapter ring, another blue enamel chapter ring at 12 o’clock with outer radial date indication and an inside ring displaying the days of the week and their planetary symbol, a semi-circular ring around the edge in the upper half of the dial displays the months and their lengths, the signs of the zodiac in the bottom half. Plain case. Dial signed, movement signed and numbered.
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Diameter: 56 mm
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Weight: 101 g
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Signed: Robert et Courvoisier
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Robert & Courvoisier are clock and watchmakers from La Chaux-de-Fonds, Switzerland. The firm was founded in 1795 as a successor to J. Robert & Fils, Courvoisier. In 1770 the firm was originally established by Josué Robert (1691–1771). After Robert’s death, a year after the company was founded, the firm was renamed Josué Robert & Fils and was led by his son Louis Benjamin Robert (1732–1781). They mainly produced large clockworks, but as Benjamin’s son-in-law, Louis Courvoisier became a companion, pocket watches were put into production. When Louis Benjamin died, Louis Courvoisier became the manager of the firm. From 1787 to 1795 the firm was called J. Robert & Fils, Courvoisier. From 1795 to 1805 it was renamed Robert & Courvoisier. Since 1805 the firm’s name was Robert, Courvoisier & Cie with Philip Grandjean as a business partner. In 1852 it became Courvoisier Frères. The firm continued under the direction of various members of the Courvoisier family until the 1930s. Along with the Jaquet-Droz firm, they were the most important makers of musical clocks and around the turn of the 18^th and 19^th centuries, their portable officers’ watches were famous.