Danish gold open faced split second chronograph Circa 1870

Yellow gold lever pocket watch
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A rare Danish, 18 carat yellow gold keyless pocket watch with split seconds chronograph, circa 1870. A hinged gold cuvette, white enamel dial with Roman numerals, outer minute track, subsidiary seconds at 6 and blued steel Breguet hands.  Split seconds mechanism set on the small subsidiary seconds with an activated pushbutton on the band at 8 o’clock. A frosted gilt movement, 20 jewels, straight line counterpoised lever escapement, cut bimetallic compensation balance with Breguet balance spring. The dial, case and movement are signed.
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Diameter: 52 mm
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Signed: Jules Jurgensen  Copenhagen
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This is very rare form of split seconds, of which Jules Jürgensen apparently made very few examples.