French watch of the watchmaker school Besançon Circa 1915

Silver open faced graduate’s pocket watch
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A French graduate’s piece, in a silver case, of the watchmaking school Besançon, circa 1915.
The case is silver and polished. The signed dial is enamel with radial Roman hours, auxiliary seconds, and blued spade hands. And it has a very fine bridge movement, cal. LeCoultre, frosted and gilt, with a large gold screw compensation balance.
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Diameter: 53 mm
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Weight: 99 g
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Signed: École Nationale d’Horlogerie de Besançon