Swiss chronograph lever watch with pulsation scale Circa 1930

Nickel-chrome keyless lever doctor’s watch by Rolex
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A fine and rare Swiss nickel-chrome open faced chronograph keyless lever doctor’s dress watch with register and pulsation scale, circa 1930. Rhodium plated 3/4 plate, Geneva striping decoration, 19 jewels, straight-line lever escapement, mono-metallic balance, selfcompensating Breguet balance spring, index regulator. Brushed silver dial with black Breguet numerals, outer minutes and fifths of a second divisions, 30 minute register dial at 12, subsidiary seconds at 6, outer blue pulsometer graduation and original blued steel spade hands. Polished case, inclined bezel, stepped band, recessed winding crown, hinged back cover. Dial, case and movement signed, case numbered. Accompanied by a fitted Rolex box.
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Diameter: 49 mm
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Signed: Rolex