Swiss 18k gold open-faced lever with thermometer Circa 1985

Gold keyless lever with regulator dial by IWC
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A fine Swiss 18-carat gold keyless lever pocket watch with regulator dial and thermometer, made in the 1980s. Gilt brass movement, Geneva striping decoration, 19 jewels, straight-line lever escapement, mono-metallic balance, shock absorber, self-compensating Breguet balance spring, micrometer regulator. Gold hinged cuvette. Matte silver dial with outer minute track and five-minute Arabic markers, subsidiary dials for the seconds at 3, the 12 hours at 9, sector for the centigrade thermometer at 6, and blued steel serpent hand. Polished case. Dial, case, cuvette, and movement signed, case numbered. Accompanied by a guarantee (now void).
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Diameter: 50 mm
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Thickness: 12 mm
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Signed: International Watch Co Schaffhausen Swiss