French silver deck chronometer made for the French Navy Circa 1920

Silver open faced deck watch by Leroy
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An extremely rare French silver open faced deck chronometer made for the French Navy, circa 1920. Ankerchronometer movement, extra-large chronometer balance, gold screws. Antimagnetic cuvette. White enamel dial with Roman hours and outer minute divisions, subsidiary seconds, blued steel hands. Massive, plain case, the back with military French inscription Service Hydrographique De La Marine – No. 21150 – L. Leroy & Cie. Cuvette, dial and movement signed and numbered.
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Diameter: 64 mm
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Weight: 203 g
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Signed: L. Leroy & Cie Paris