Swiss 18 carat yellow gold Art Deco keyless dress watch Circa 1920

Gold watch made for Tiffany & Co. New York
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A Swiss 18 carat yellow gold Art Deco keyless dress watch made by International Watch Co., Schaffhausen, circa 1920. A polished case back, with an engraving in the center, the cypher I I S P. And an engraving inside the cuvette Esprit de Corps / 1913-1923. It is a French phrase meaning the morale of a group. A silver dial with applied yellow gold suspended Arabic numerals, subsidiary seconds at 6 and yellow gold Breguet hands. A rhodium plated movement, going barrel,  gold screwed chaton (setting) on the central wheel, straight line lever escapement, 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 and movement are signed.
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Diameter: 47 mm
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Weight: 66 g
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Signed: Tiffany & Co. / International Watch Co., Schaffhausen
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The dial is slightly oxidized.