American silver split-second chronograph pocket watch Circa 1900

USilver keyless lever pocket watch 
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A very fine American silver split-second chronograph keyless pocket watch, circa 1900. Accompanied by a box. A polished case, silver hinged cuvette, hinged case back with initials, split-second control button at 11 o’clock. White enamel dial with painted Arabic numerals, outer minute divisions 1/5th second track with red 5-second Arabic markers, sunk subsidiary seconds dial and blued steel spade hands. Nickel, half-plate movement, 21 jewels, straight-line calibrated lever escapement, cut bimetallic compensation balance and blued steel Breguet balance spring. Cuvette and movement signed.
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Diameter: 52 mm
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Signed: Shreve, Crump & Low  Boston
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The case is slightly scratched and the dial is chipped.