English lever watch by Benson with a black dial Circa 1922

Silver deck watch with black dial
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An English lever by Benson with a black dial in a silver open-faced case, hallmarked London circa 1922. Gilt three-quarter plate keyless movement with going barrel. Plain cock with polished steel regulator, compensation balance with blue steel spiral hairspring. English table roller lever escapement. Unusual signed black enamel dial with white Roman numerals, subsidiary seconds, and gilt hands. Plain silver open face case. Maker’s mark ‘JWB Ld’ in a rectangle.
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Diameter: 56 mm
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Signed: J.W. Benson Ludgate Hill London