Swiss navigation deck watch with centre seconds Circa 1940

Open faced deck watch by Longines
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A Swiss navigation deck watch with 24h indicator, centre seconds and power reserve indicator, circa 1940.
Steel polished case with slide Start/Stop. Silvered dial with Arabic numerals, centre 24h indication, centre seconds and blued steel hands. Rhodium-plated half-plate movement with Geneva Striping decoration, six adj., twenty-one jewels, indirect centre seconds, Glucydur screw balance and cam-type fine adjusting device.
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Diameter: 54 mm
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Weight: 138 g
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Signed: Longines watch co. Swiss