Swiss gold watch with split seconds chronograph Circa 1874

Gold open faced lever pocket watch
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An early pocket watch split seconds chronograph, special reset mechanism by Stauffer & Co Swiss made for Mappin & Webb London, circa 1874. An 18 carat  gold, London import punch 1874, very fine chronograph movement with split seconds, English construction, maker’s punch Stauffer & Co., compensation balance with gold screws, very fine caliber, with unusual rest mechanism for split seconds hand, original enamel dial with 60 min. counter, steel hands.
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Diameter: 51 mm
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Weight: 113 g. 
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Signed:  Stauffer & Co   Ponts-Martel
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Dial with small imperfections, case with peripheral flat dent.