Swiss gold lever chronograph with tachometer Circa 1941

Rose gold open faced chronograph by Patek Philippe
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A rare and attractive Swiss 18 carat rose gold open faced keyless lever chronograph watch with tachometer scale, circa 1941. Mechanical movement stamped with the Geneva seal, 23 jewels. Rose gold dial, applied rose gold baton and Arabic numerals, outer railway five minute divisions and tachometer scale, two subsidiary dials indicating 30 minute register and constant seconds. Plain case, snap on back. Case, dial and movement signed, case and movement signed.
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Diameter: 46 mm
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Signed: Patek Philippe & Co. Geneve