French onyx open faced keyless square watch Circa 1930

Onyx watch by Boucheron
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A fine French onyx open faced square watch, circa 1930. Manual winding, jewelled lever movement.
Salmon dial, rectangular cut indexes, onyx case, stainless steel pendant and engraved back, dial signed.
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Diameter: 44 x 44 mm
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Signed: Boucheron
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Accompanied by a Boucheron presentation case.