Extremely rare Swiss steel open faced deck chronometer Circa 1915

Torpedo boat deck chronometer by Longines
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An extremely rare Swiss steel open faced torpedo boat deck chronometer, circa 1915. Gilt chronometer movement in deck watch quality, screwed gold chatons, special fine adjusting device, adjusted in eight positions. Silver-plated dial with Arabic hours and outer minute divisions, 50h power reserve indicator, blued steel hands. Plain case. Dial signed, case numbered, movement signed and numbered, case and movement with matching numbers.
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Diameter: 66 mm
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Weight: 254 g
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Signed: Longines Chronomètre Fab. Suisse