Swiss stainless steel keyless military pocket watch Circa 1940

Rolex with a black military dial
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A rare Swiss, stainless steel, keyless wind military pocket watch with a black military dial, circa 1940. 15-Jewel Swiss lever movement, cut and compensated bimetallic balance.
Black dial, gilt Arabic numerals, gilt outer minute track with five minute markers, subsidiary seconds at 6, blued steel spade hands with luminous inserts.
Polished round case, screw down back, engraving reads. Case, dial and movement signed.
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Diameter: 50 mm
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Signed: Rolex  Swiss