French onyx open faced lever watch with date Circa 1930

Onyx watch with date by Boucheron
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A fine French onyx open faced watch with date, circa 1930. Manual winding, jewelled lever movement.
Salmon dial, black painted Arabic numerals, outer minute track, aperture for date, onyx case, stainless steel pendant, sapphire crystal display back, dial signed.
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Diameter: 44 mm
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Signed: Boucheron