Swiss 18K gold split-seconds chronograph watch Circa 1905

Gold open faced lever watch
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A very fine Swiss, 18K gold, keyless, split-seconds chronograph pocket watch, with instantaneous 30-minute register, pulsometer and painted on enamel miniature of a young lady on the cuvette, circa 1905. Specially made for an important Argentinian customer in 1905. A polished case, back with champlevé blue, red and green enamel initials. Hinged gold cuvette with an enamel portrait of a young lady.
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White enamel dial, red Arabic numerals, 24-hour inner red Arabic ring (13-24), outer minute track, outermost chronograph ring with pulsometer scale graduated for 30 pulsations, instantaneous 30-minute register at 12 o’clock, subsidiary seconds. Blued steel Spade hands. Movement adjusted by Edouard Matthey Tissot, nickel, Geneva striping decoration, 25 jewels, straight-line lever escapement, cut-bimetallic compensation balance with blued steel Breguet balance spring, swan-neck micrometre regulator, visible split-seconds mechanism. Dial and case signed. Property of a Swiss Collector.
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Diameter: 55 mm