Swiss silver open faced split-second chronograph Circa 1920

Split-second chronograph by Longines
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A fine Swiss, keyless silver watch with square button split-seconds chronograph and instantaneous 30-minute register, circa 1920. Accompanied by an original fitted box. Chronographe Rattrapante by Longines, Swiss. A solid, polished case, hinged silver engraved cuvette, split-seconds gold pushbutton on the case band. White enamel dial with bold painted dauphine numerals, outer Arabic minute and chronograph divisions, subsidiary seconds dial and 30-minute register. Blued steel Breguet hands. A rhodium-plated movement, 21 jewels, straight-line lever escapement, monometallic balance with screws, Breguet balance spring, index regulator, visible split-seconds mechanism. Dial, case and movement signed.
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Diameter: 52 mm
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Signed: Longines  Swiss