Swiss gold watch made for the Canadian market Circa 1920

Swiss open faced lever dress watch
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A thin and elegant 18k yellow gold Swiss keyless dress watch,  made for the Canadian market, circa 1920. A solid, polished, hinged gold cuvette. Double-sunk white enamel dial with painted Arabic numerals, outer minute track, subsidiary seconds dial. Blued steel spade hands. A nickel movement, 21 jewels, straight-line lever escapement, cut-bimetallic compensation balance adjusted to five positions, blued steel Breguet balance spring, eccentric cam micrometre regulator. Dial and movement signed, case numbered.
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Diameter: 47 mm
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Signed: Omega Watch Co.  Swiss