Possibly unique Swiss gold minute repeating lever Circa 1963

Gold open faced repeating keyless lever by Patek Philippe
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An extremely fine, possibly unique and very attractive Swiss 18 carat gold open faced two train trip minute repeating keyless lever watch, encased circa 1963. Keyless two train lever movement (1909), 33 jewels, bimetallic compensation balance, repeating on two polished steel hammers onto two gongs. Silvered matte dial with applied gold baton numerals, gold dauphine hands and subsidiary seconds. Plain case with stepped bezel, snap on back, trip repeating through the crown. Case, dial and movement signed, case and movement signed.
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Diameter: 51 mm
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Signed: Patek Philippe Genève Swiss