Very fine Danish open faced one minute tourbillon Circa 1987

Gold twin barrel one minute tourbillon by Urban Jürgensen
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A very fine and rare Danish 18 carat gold open faced twin barrel one minute tourbillon with carriage mounted remontoire, constant force escapement, jumping dead beat seconds and power reserve, circa 1987. Skeletonized twin barrel gilded nickel-silver movement (manufactured between 1979 and 1982), carriage mounted remontoire, constant force escapement, polished three armed steel tourbillon carriage, bimetallic compensation balance, gold screws. Five hinged double spring glazed gold cuvette. Engine turned silver dial with Roman numerals on black chapter ring, aperture for 36 hours power reserve, subsidiary dead beat seconds and gold Breguet hands. Heavy plain case. Case, dial and movement signed.
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Diameter: 62 mm
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Signed: Urban Jürgensen & Sønner Copenhagen – Derek Pratt Invenit et Fecit