Swiss silver watch with chronograph and register Circa 1981

Silver lever in the original box
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A fine silver  Silver keyless pocket watch with a chronograph and semi-instantaneous 30-minute register, circa 1981. Accompanied by the original fitted box. An engine turned back, polished case. Hinged silver cuvette engraved with exhibition prize medals. White enamel dial, bold Arabic numerals, outer minute track with 1/5th seconds divisions, 30-minute register, subsidiary seconds and blued steel spade hands. A frosted gilt movement, 12 jewels, straight-line lever escapement, cut bimetallic compensation balance with Breguet balance spring, index regulator, and visible chronograph work on the back plate. Dial, case, cuvette and movement signed.
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Diameter: 50 mm
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Signed: Omega  Swiss
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The case is worn en slightly scratched, and the dial is chipped.