Swiss repoussé astronomical verge with alarm Circa 1750

Silver repoussé verge watch by Collomby & Girod
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A very fine and rare Swiss silver pair cased repoussé verge pocket watch with mnemonic days of the week, astronomical months calendar and alarm, circa 1750. Hinged gilt brass full plate movement with square baluster pillars, fusee and chain, verge escapement with plain brass three arm balance, short flat balance spring, pierced and engraved gilt brass continental cock and backplate furniture, silver regulation disc, foliate engraved fixed barrel for the alarm, steel train, sounding on a bell in the back of the case. Silver champlevé dial with Roman numerals, trefoil half hour divisions, inner quarter hour track, outer minute track and further Arabic five minute numerals, outermost mnemonic days of the week and astronomical months calendar, revolving central alarm setting disc with Arabic numerals, fine original steel hands.  The outer case back decorated with a scene of Athena seated in a chamber and holding a spear, an owl at her feet, pierced and engraved foliate border with four cartouches of shells and fruit, the bezel decorated to match, the band of the inner case finely pierced and engraved with scrolling foliage and centred by a grotesque mask, apertures for going and alarm trains. Movement signed.
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Diameter: 53 mm
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Signed: Collomby & Girod Geneva
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Collomby & Girod, master watchmakers working in Geneva from the second quarter of the 18th century until the early 19th century. Known for repeating watches and pair cased watches with repoussé decoration.