Swiss 18K gold dress watch with enamel erotic portrait Circa 1925

Gold open faced lever dress watch
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A very fine and rare Swiss 18K gold and enamel keyless lever dress watch, circa 1925. The front border is finely painted on enamel with floral decoration against a translucent yellow guilloché enamel background, and the back cover with a lady at ease resting on a marble bench in a park set on a yellow translucent guilloché enamel background.
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A matte silver dial, engine-turned centre, black painted Arabic numerals, outer minute track, subsidiary seconds. Blued steel Cathedral hands. A rhodium-plated movement, Geneva striping decoration, 17 jewels, straight-line lever escapement, monometallic balance, self-compensating Breguet balance spring, index regulator. Dial and movement signed.
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Diameter: 40 mm
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Signed: Tavannes Watch Co Swiss
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The case is slightly worn, the dial is patinated.