Swiss platinum, diamond and pearl set lever watch Circa 1920

Keyless lever pendant watch with chain by Meylan
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A fine Swiss platinum, diamond and pearl set keyless lever pendant watch with chain, circa 1920. Retailed by Black, Starr & Frost. Nickel finished lever movement, stamped twice by the maker, 18 jewels, bimetallic compensation balance. Silvered matte dial with Arabic numerals, outer calibrated minute track. Case with diamond set filigree snap on back, further enhanced with outer diamond set rim, engraved bezel. Accompanied by a BSF platinum, diamond and pearl set watch chain. Movement signed by maker, chain stamped BSF for Black, Starr & Frost.
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Diameter: 26.5 mm
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Signed: C.H. Meylan Brassus