Rare French médaillon à tact forme collier watch Circa 1805

Large gold, enamel, pearl and diamond set cylinder watch by LeRoy
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Very fine, rare and large French 20 carat gold, enamel, pearl and diamond set hunting cased key wind médaillon à tact forme collier pocket watch, circa 1805. Gilded brass movement with going barrel, cylinder escapement, mono-metallic (probably gold) balance, blued steel flat hairspring. Translucent enamel over guilloché engine turning with sunburst effect and arrow à tact hand set with rose cut diamonds, the back decorated en suite with central sunburst effect, both with finely reeded rims band set with 24 touch pieces (including the pendant), 12 pearls for the hours and 12 seed gold for the half hours. Cuvette detachable and polished with apertures for winding, setting, regulating and the dial. Movement signed: LeRoy N3381 Aucidnt Palais Royal N66 Tournes Leguille à Gauche Remonte à Droite. Case signed, movement signed and numbered. Accompanied by 18 carat gold chain and winding key.
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Diameter: 62 mm
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Signed: LeRoy
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Designed by Breguet, few examples of this type of a watch were made by Breguet. Breguet classified his souscription calibers as ‘petite’, ‘moyenne’ and ‘grande’. Out of about 915 souscription type watches that Breguet made, only about 35 ‘petites’ are known to exist. They were the most expensive, averaging about SFr. 1700. Breguet introduced them in the spring of 1799. Le Roy Hologer de S:A:I et R Madame à Paris, is also famous for producing this type of pendant watch using similar Breguet soucription calibers.