English watch in a gold open faced case Circa 1920

Late gold English lever watch
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An English lever in a 18 carat gold open faced case, hallmarked London circa 1920. Gilt three-quarter plate keyless movement with going barrel. Plain cock with polished steel regulator, diamond endstone. Compensation balance with blue steel overcoil hairspring. English table roller lever escapement, screwed in jewelling, escape and lever pivots with endstones. Signed white enamel dial with subsidiary seconds, Roman numerals and blue steel hands. Plain 18-carat open-faced case. Maker’s mark ‘RS’ in a rectangle.
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Diameter: 51 mm
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Signed: Rotherhams London Adjusted
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A late example of high-quality English watchmaking in excellent condition.