Danish remarkable gold watch in mint condition Circa 1980

Gold lever with one minute tourbillon and power reserve indicator
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A remarkable Danish 18 carat gold open faced lever pocket watch with one minute tourbillon and 36 hour power reserve indicator, circa 1980. Made by Derek Pratt, Chef d’Atelier at Urban Jürgensen & Sønner. Glazed 3/4 plate movement, two barrels and large gold screwed compensation balance. Silver dial with Roman hours, subsidiary seconds, power reserve indicator and blued hands. Dial and movement signed. Plain case.
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Diameter: 62 mm
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Weight: 232 g
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Signed: Urban Jürgensen & Sønner Copenhagen
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Famous watchmaker and restorer Derek Pratt (1938-2009) created this marvellous masterpiece in his capacity as Head Watchmaker at Urban Jürgensen & Sønner. In the tradition of master watchmakers like Breguet, Arnold and Helwig he produced exceptional pocket watches of a quality that is hard to find these days. 
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This piece is perhaps the most exclusive and most complicated watch made by Urban Jürgensen & Sønner. This pocket watch with a one minute tourbillon represents an innovative and revolutionary approach to tourbillon design. Twin going barrels with power reserve indication. The barrels are placed side by side and operate in parallel, simultaneous winding. It took Derek Pratt, the chef d’atelier of Urban Jürgensen & Sønner, nearly 4.300 hours to make this pocket watch.