Very thin Swiss 18K yellow gold pocket watch Circa 1980

Gold open faced lever pocket watch
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A very fine Swiss, thin, 18K yellow gold pocket watch, circa 1980. A solid, polished case, ivory colour dial with painted Breguet numerals, outer minute divisions. Yellow gold Breguet hands. A rhodium-plated movement, Geneva striping, 18 jewels, straight-line lever escapement, monometallic balance adjusted to five positions, shock absorber, self-compensating Breguet balance spring, and an index regulator. Dial, case and movement signed.
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Thickness: 5 mm
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Diameter: 40 mm
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Signed: International Watch Co.  Schaffhausen
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The case is slightly scratched.