Rare Swedish gold with Massey escapement Circa 1790

Four coloured gold pocket watch
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A rare four coloured splendid pocket watch with Massey-escapement, important Swedish watchmaker, circa 1729-1799.
An 18 carat four coloured case, engraved flower relief on the back, Swedish Hallmarks, signed movement.
Formerly verge escapement customized to massey escapement, enamel dial, golden hand, movement intact.
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Diameter: 48 mm
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Weight: 83 g
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Signed:  Augustin Bourdillon  Stockholm