Fine and rare Swiss gold and lapis lazuli lever Circa 1921

Gold and lapis lazuli keyless lever by Patek Philippe
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A fine and rare Swiss 18 carat gold and lapis lazuli keyless lever watch, circa 1921. Nickel finished lever movement, 18 jewels, bimetallic compensation balance, wolf’s tooth winding. Brushed gold dial with black Breguet numerals, outer railway minute divisions, blued steel hands and engine turned subsidiary dial for constant seconds. Bezel set with lapis lazuli and four engraved sections, lapis lazuli set bow, case sides set with lapis lazuli and four engraved sections, inscribed snap on case back set with lapis lazuli and with four engraved sections. Case, dial, and movement signed, case and movement numbered.
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Diameter: 45 mm
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Signed: Patek Philippe & Co Geneva Switzerland