English gold watch with stoppable centre second Circa 1872

Gold open faced lever pocket watch
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Technical rarity, one of the earliest known Chronoscopes by Adolph Nicole, circa 1872.
An 18 Carat pink gold, London hallmark of the year 1872, case punch of Adolph Nicole, matching number 7008 on the case and movement, patented movement invented by Adolph Nicole in 1862, anker chronometer with winding mechanism patented by Nicole, Nielsen & Co with a stoppable centre second, reset by pushing the crown, regulator dial, signed, blued steel hand, generally nice condition, very rare.
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Diameter: 51 mm
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Weight: 116 g
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Signed:  Adolph Nicole  London
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In 1862, Adolphe Nicole invented the first pocket watch whose second hand can be stopped and reset to zero by pressing a button.
The watch here is one of the few well known watches still preserved.
(dial with small defects).