Swiss gold and enamel heptagonal dress watch Circa 1920

Gold and enamel heptagonal open dress watch
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A Swiss yellow gold and enamel heptagonal open faced keyless lever dress watch, circa 1920, manual winding lever movement, 15 jewels, bimetallic balance.
Gilt matte dial, Arabic numerals, subsidiary seconds, 18k yellow gold case, polychrome enamel to the back depicting a mountain scene with a flower tree, Art Deco style foliate decoration with champlevé enamel inserts to the rim for both sides, snap-on case back,case, dial and movement signed.
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Diameter: 42 mm
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Signed: Mido