French silver quarter repeating pocket watch Circa 1780

Silver open faced pocket watch 
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A rare early quarter repeating pocket watch with Sully type frictional rest escapement, circa 1780.
To the best of our knowledge this is the only existing pocket watch that combines a Sully type escapement with a striking mechanism.
Silver case, enamel dial, fine full plate movement, chain/fusee, Sully type frictional rest escapement with vertical escape wheel, three arm brass balance.
A particular treat for every collector, a technically challenging and truly remarkable timepiece.
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Diameter: 61 mm
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Weight: 157 g.
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Signed:  Coutterez   Lyon