Swiss staybrite steel lever with two-tone sector dial Circa 1940

Staybrite steel keyless lever watch by IWC
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A fine, rare, and thin Swiss staybrite steel keyless lever pocket watch with two-tone sector dial, circa 1940. Rhodium-plated movement, Geneva striping decoration, 17 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating Breguet balance spring. Two-tone silver dial with black Arabic and baton numerals, outer minute divisions, guilloché subsidiary seconds dial, and original blued steel spade hands. Case with stepped-down bezel. Dial and movement signed, case numbered.
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Diameter: 48 mm
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Thickness: 10 mm
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Signed: International Watch Co Schaffhausen