Swiss silver watch with experimental pirouette escapement Circa 1820

Silver technically highly interesting pocket watch
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A technically highly interesting pocket watch with an experimental pirouette rack lever escapement made by Frédéric Louis Favre in Le Locle, Switzerland, circa 1820. The numbered open faced case of English construction was crafted from silver and still has its original cuvette. The white enamel dial has Arabic hour numerals, outer minute divisions, a subsidiary 15 seconds counter at 6 o’clock and blued steel hands. The movement is marked 1^ER Classe and features an extremely rare combination of a rack lever and Massey escapement, also known as the pirouette lever, a diamond end stone and an escapement wheel with 30 teeth.
The movement is signed.
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Diameter: 57.5 mm
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Weight: 143 g
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Signed: Fréd. L. Favre au Locle
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This timepiece is an absolute rarity from a technical point of view.
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Favre-Bulle
Frédéric-Louis Favre-Bulle (1770-1849) was one of the most important chronometer makers in the history of Swiss watchmaking and especially that of Le Locle. He was a contemporary of Jacques-Frédéric Houriet (1743-1830) and Urban Jürgensen (1776-1830).