Swiss platinum and gold lever with black enamel Circa 1925

Very rare open faced keyless lever by Patek Philippe
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A very rare Swiss platinum and 18 carat gold open faced keyless lever watch, circa 1925. Retailed by E. Gübelin. Keyless lever movement, 18 jewels. Silvered dial with applied platinum Breguet numerals. Case with black enamel decoration including bow and crown, snap on back. Case, dial and movement signed and numbered, case and dial further signed by the retailer E. Gübelin.
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Diameter: 43 mm
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Signed: Patek, Philippe & Cie Geneva-Switzerland