Swiss navigation deck watch with centre seconds Circa 1940

Silver deck watch by Longines St. Imier, GCT (Greenwich Civil Time)
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A Swiss navigation deck watch with a 24-hour indicator, centre seconds and 24-hour power reserve indicator made for the US Army / Air Force, circa 1940.
Chromium-plated case with engraved bezels and screw back. Signed silvered dial with Arabic numerals, centre 24-hour indication, centre seconds, and blued steel hands. Signed, rhodium-plated 2/3 plate movement with Geneva Stripes 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: 129 g
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Signed: Longines G.C.T. Swiss