Swiss commemorative watch to celebrate independence Circa 1926

Gold and enamel celebration pocket watch by Longines
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A Swiss gold and enamel commemorative pocket watch to celebrate the 150th anniversary of the signing of the Declaration of Independence, circa 1926. Retailed by A. Wittnauer & Co. This watch features a nickel finished lever movement with a bimetallic compensation balance. The bridges are designed in the shape of 1776, which marks the Declaration of American Independence. It has a silvered dial, signed A. Wittnauer Co. Sesqui-Centennial Exhibition 1926, with stylised Arabic numerals, outer railway minute divisions, and stylised hands. The case is made of gold and adorned with blue enamel bands, bezels and a bow, and complete with a glazed exhibition back.
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Diameter: 50 mm
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Signed: A. Wittnauer Co. Sesqui-Centennial Exhibition 1926
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Dial is clean and well maintained. The case is intact with no cracks. Movement is slightly dirty and tarnished but functions when wound.
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The Sesqui-Centennial International Exposition was a world’s fair held in Philadelphia, Pennsylvania, in 1926. It was organised to celebrate the 150th anniversary of the signing of the United States Declaration of Independence and the 50th anniversary of the 1876 Centennial Exposition.
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A. Wittnauer & Co. is a Swiss watch shop founded by Eugène Robert in either 1866 or 1868 in Geneva. Prior to this, Robert established a watch shop with his brother-in-law, Albert Wittnauer, in the United States around 1845. After Eugène Robert withdrew from the company in 1890, Albert C. Wittnauer took over the business, and it was subsequently named A. Wittnauer & Co. 
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Wittnauer owned several agencies in the U.S. and Canada and exclusively offered watches from renowned Swiss companies such as Longines, Agassiz Watch Co., Angelus, Girard-Perregaux, and Louis Audemars. Additionally, the company operated its own watch factory under its name.