Swiss rare “IWC” Schaffhausen deck watch Circa 1940

Steel open faced deck watch by International Watch Co.
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A Swiss rare “IWC” Schaffhausen deck watch of the British Ministry of Defence “Hydrographic Dept.” with original wooden box, circa 1940.
Steel polished case with screw back and military engraving “H.S. 3”. Enamel dial with radial Arabic numerals, centre seconds, numbered “4893” and blued spade hands. Frosted, gilt, chatoned 2/3 plate movement with gold screw compensation balance and index spring fine adjusting device.
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Diameter: 51 mm
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Weight: 107 g
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Signed: International Watch Co.