Swiss 18k gold open faced minute repeating lever Circa 1915

Fine gold repeating keyless lever by Patek Philippe
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A fine Swiss 18 carat gold open faced minute repeating keyless lever, circa 1915. Retailed by Tiffany & Co. Extra mechanical keyless lever movement, 31 jewels, repeating on two steel hammers. Gold cuvette. Gold dial with Roman numerals, blued steel outer railway minute divisions, moon style hands and subsidiary seconds. Case with hidden hinges, inlaid blue and white initials to the back, repeating slide in the band. Case and movement signed by watchmaker and retailer, dial signed by retailer, cuvette numbered.
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Diameter: 47.5 mm
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Signed: Patek Philippe & Co Switzerland