Rare Swiss gold and diamond set knife edge watch Circa 1966

Gold open faced keyless watch by Patek Philippe
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A fine and rare Swiss yellow gold and diamond set open faced knife edge watch, made in 1966. Manual winding jewelled nickel lever movement, 18 jewels.
Silvered dial, 18k yellow gold case, diamond set bezel, solid snap on case back, case, dial and movement signed.
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Diameter: 42 mm Length
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Signed: Patek Philippe Genève
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 Patek Philippe Extract from the Archives confirming the date of sale in 1967 with 50 diamonds ~ 0.87 cts.