Swiss gilt metal Art Deco octagonal shaped dress watch Circa 1915

Gold keyless octagonal open faced
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A rare Swiss, gilt metal Art Deco octagonal shaped keyless dress watch, made by Longines, Saint-Imier, circa 1915. A polished case back, the case is made by Illinois Watch Case Co., Elgin, Illinois, U.S.A. Silver colour dial with applied yellow gold radial revolving Breguet numerals, yellow gold Lozenge hands and subsidiary seconds at 6.
A rhodium plated movement, going barrel, gold screwed chaton (setting) on the central wheel, straight line lever escapement, seventeen jewels, five adjustments, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator with swanneck spring and micrometric screw. The dial, case and movement are signed.
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Diameter: 43 mm
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Weight: 44 g
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Signed: Longines, Saint-Imier