Swiss Rolesium steel keyless pocket watch Circa 1940

Rolesium steel open faced watch
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A fine, Rolesium steel, keyless dress pocket watch with “Class A” Ultra Prima movement, circa 1940. Rolesium Prince Imperial Rolex, “Chronomètre Prince Imperial”. Two-body, satiné shaped case. Two-tone matte silver dial and satiné with black Arabic numerals, outer minute track, subsidiary seconds. Blued steel Lozenge hands. Ultra Prima, shaped, rhodium plated movement, 17 jewels, straight line lever escapement, monometallic balance timed in six positions, with Rolex patented cap, self compensating Breguet balance spring, index regulator. Dial, case and movement signed.
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Diameter: 41 x 37 mm
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Signed: Rolex  Swiss