Swiss rare skeletonized quarter repeating watch Circa 1815

Gentleman’s extremely rare repeating pocket watch
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A Swiss gentleman’s extremely rare, skeletonized quarter repeating pocket watch with experimental pin wheel escapement, circa 1815.
Silver case with an enamel chapter ring with Arabic numerals. Skeletonized full-plate movement, keywind, 2 hammers, 2 gongs,
applied rack strike with mirror-polished steel levers, pin wheel escapement, three-arm ring balance.
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Diameter: 61 mm
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Weight: 145 g.
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Signed:  Breguet & Fils Vallée de Joux
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Normally one finds the highly unusual pin escapement used here in long case or turret clocks. The pin escapement was originally invented by Italian physician and astronomer Galileo Galilei; it is easier to make than a lever escapement and much more robust. The construction has two pallets that usually are of different length and catch and release the pins on the wheel alternately, the wheel is perpendicular to its rotation plane. Galileo’s invention paved the way for a great number of later escapement mechanisms.