Unusual English gold watch with duplex escapement Circa 1798

Fine and unusual pink gold open faced pocket watch
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A fine and unusual English pink gold open faced pocket watch with duplex escapement, circa 1798, hinged gilt brass 3/4 plate duplex escapement movement with cylindrical pillars, going barrel with its own bridge, two-arms cut bimetallic compensation balance with poising and timing screws, free sprung blued steel helical balance spring and ruby endstone.
White enamel dial, eccentric subsidiary dial for hours and minutes with Roman numerals, symmetrical subsidiary dial for constant seconds, outer Arabic minute ring, three body, massive, “consular” case polished with integral dome, marked D.W.(Daniel Walker) and stamped with London hallmarks from 1798, dial and movement signed.
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Diameter: 60.5 mm
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Signed: Grant Fleet Street London