Swiss gold watch with independent dead centre seconds Circa 1875

Gold open faced lever watch 
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A fine and rare Swiss, 18K yellow gold, a keyless pocket watch with two-train independent dead-seconds, circa 1875. A polished case, the back with engraved monogram. Hinged gold cuvette. White enamel dial, radial Roman numerals, outer minute track and outermost Arabic five-minute numerals, subsidiary seconds. Gold spade hands, steel seconds hand. A rhodium-plated movement, two-train with tandem winding, 29 jewels, Geneva striping decoration, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, independent seconds chronograph with button in the crown for stop/start.
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Diameter: 53 mm
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Signed: No Name
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Although without a chronograph mechanism, this watch may be considered a form of a chronograph. It differs from most independent seconds watches in that the start/stop button is placed in the crown and therefore has great ease of action so that it can be used for timing an event. It does not of course have the return-to-zero function of the true chronograph.