Swiss platinum and enamel open faced dress watch Circa 1928

Open faced keyless lever dress watch by Patek Philippe
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A fine Swiss platinum and enamel open faced keyless dress watch, circa 1928. Retailed by Tiffany & Co. Keyless lever movement, 18 jewels. Silvered dial with applied Arabic numerals and subsidiary seconds. Thin case, blue, black and gold enamel accents to the bezels, pendant and bow, snap on back with blue enamel initials BM to the centre.  Case and movement signed and numbered by watchmaker, dial signed by retailer.
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Diameter: 44 mm
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Signed: Tiffany & Co Switzerland – Patek, Philippe & Co Geneva