Highly important Danish gold chronometer pocket watch Circa 1812

Exquisitely made gold chronometer
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Highly important, exquisitely made and very rare Danish 18K rose gold pocket Chronometer with Arnold spring detent Chronometer escapment, circa 1812. The outer case is a polished, massive case in 18K gold with punch-marked IFH in a heart for the case maker Johan Fridrich Hansemann, with ”Fra FR VI til Commandeur V Krusenstern” engraved, the inner case is also polished, 18K gold with punch-marked IFH. White enamel dial with radial Roman numerals, outer minute track, large subsidiary seconds and blue steel spade hands.
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Frosted gilt movement, bridge calibre, fusee with chain and Harrison’s maintaining power, gold train, a winding square surrounded by a dust pipe fixed on the top of the unusual bridge for the fusee and barrel. Arnold’s spring detent escapement is mounted on a platform to be easily adjusted by a screw. Cut bimetallic compensation balance with two arms, peripheral gold temperature adjustment screws, balance and escape wheel pivots jewelled in screwed chatons, and helical balance spring. Dial, case and movement signed.
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Diameter: 60 mm
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Thickness: 25 mm
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Signed: Urban Jürgensen  Copenhagen
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This watch is illustrated in The Jurgensen Dynasty by John Knudsen. In the book, there is an interesting mention of this exact watch: The famous Russian astronomer Councillor of State Shubert wrote about this chronometer, in the journal of the Imperial Academy of Sciences in Saint-Petersburg. Mr Urban Jurgensen in Copenhagen constructs chronometers which are equal to the best English ones.
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One of these chronometers in gold, made with the greatest accuracy and the highest levels of luxury, which the King of Denmark commissioned from Urban Jurgensen to be presented to the first person in Russia to sail around the world, Commander Krusenstern, therefore bears the engraving: From Frederik vi to Commander von Krusenstern. Its rate was tested for over a month by our observatory at the Imperial Academy of Sciences. In the trials, the chronometer’s precision was found to be so excellent that only a few chronometers could be placed on par with it.