Rare English double-cased repoussé verge watch Circa 1790-92

Gold pair cased pocket watch by Harry Potter Sr.
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An excellent and rare English 18K gold double-cased repoussé verge watch, circa 1790-1791.
Full plate movement with verge escapement, chain and fusee. Key winder, fire-gilt, signed, applied, florally engraved and sawn ornaments, square baluster pillars, three-arm steel balance, pierced balance cock with a noble coat of arms. The coat of arms shows a dwarf head between two scythes crowned by a crown. Signed: Harry Potter London. Enamel dial with Roman radial hours, outer minutes track with Arabic five minutes numerals, and steel hands set with diamonds. Signed: Potter London. Solid 18k gold double case. Inner case smooth. Outer case with a relief-like figurative scene.
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Diameter: 54 mm
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Signed: Potter London
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Marking:
[1] Leopard’s face crowned (London assay office mark);
[2] q (London date letter for 1791–92);
[3] Lion passant (English quality mark for sterling)
[4] Sovereign’s head
[5] R P (maker’s mark, possibly Robert Piercy, working 1775–56).