Swiss gold open faced watch with monogram Circa 1909

Gold lever open faced watch
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An exceptional Swiss precision pocket watch quality “EXTRA”, made for D.E. Black Calgary with dedication, circa 1909. A 14K pink gold, monogram on back, dome with dedication from 1909, Ankerchronometer in top quality, probably audemars Piguet caliber, marked “Swiss”, quality “Extra Superior”, special and very rare circular-grain finish, wolf’s toothing, screwed gold chatons, fine adjusting device, signed enamel dial, blued steel hands.
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Diameter: 51 mm
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Weight: 99 g
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Signed: D.E. Black  Calgary
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Revision recommended (winding crown