Swiss gold and aqua blue translucent enamel watch Circa 1915

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A Fine Swiss 18K gold and enamel keyless hunting cased dress pocket watch, circa 1915.
The Royal Blue by Tavannes Watch Co. Swiss, circa 1915. The front and back covers overlaid with translucent aqua blue enamel over a radial engine-turned ground, central white enamel dot, white champlevé enamel line borders.

Matte silvered dial with engine turned centre, radial painted black Roman numerals, outer minute track, subsidiary seconds, Blued steel spade hands. Rhodium-plated movement, Geneva striping decoration, 15 jewels, straight-line lever escapement, monometallic balance with three adjustments, Breguet balance spring, index regulator. Dial and movement signed.
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