Swiss debaufre escapement in a silver case Circa 1820

Silver watch with Debaufre escapement
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A Swiss debaufre in a silver open-faced case, circa 1820. Full plate gilt keywind movement with going barrel, polished steel ratchet and click. Plain cock with garnet endstone, marked on the table Patent Jewelled Vertical. Plain three-arm steel balance with blue steel spiral hairspring, polished steel Bosley regulator. Debaufre escapement employing two polished steel escape wheels acting alternately on a single steel roller. Signed white enamel dial with subsidiary seconds, black Roman numerals, blue steel seconds hand, gilt hands. Plain silver open face case with ribbed middle.
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Diameter: 49 mm
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Signed: My Patry
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A rare escapement, also known as a chaff cutter, Ormskirk or club-footed verge. It was the first frictional rest escapement invented by Debaufre in 1704. Rarely used until it was taken up by Lancashire makers early in the 19th Century. The escapement is not affected by variations in power as was the case with the verge and some watches dispense with the fusee.