Exceptionally fine, unique German gold lever watch Circa 1980

Gold keyless lever one flying minute tourbillon by Thomas Engel
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An exceptionally fine, unique German 18 carat gold keyless lever one minute flying tourbillon regulator pocket chronometer with 40 hour power reserve, annual calendar, sidereal and mean solar times, 12 and 24 hour indications and thermometer, started in 1978 and finished in 1980. Gilt ½ plate movement, Geneva Striping decoration, very light flying tourbillon, three armed Y shaped carriage by Richard Daners with lateral lever escapement with divided lift, cut bimetallic compensation balance with special non magnetic Nivarox Prima balance spring with Phillips terminal curves with two pins for adjustment between horizontal and vertical positions, entire train jeweled, the annual calendar driven by differential gearing from the sidereal train, unusual setting of all functions utilizing a pin protruding from the band at 11 o’clock and pulling the crown. Gold glazed cuvette. Gold dial, engine turned, eccentric mean time set at 3 o’clock, marked by applied gold sun, Roman numerals calibrated for 12 hours with original blued steel Breguet hands, concentric gold 24 hour baton hand, symmetrically to the left sidereal time chapter, marked by applied blued steel star, Roman numerals and blued steel Breguet hands revolving once in 24 hours, outermost annual calendar ring with gold wavy hand, 40 hour up-and-down aperture at 12 o’clock, subsidiary seconds at 6 o’clock, silver thermometer sector on the movement visible through glazed cuvette with gold scale plate. Similar, second silver dial enclosed. Screwed case back decorated with wave pattern engine turning, engine turned band, ball shaped, swiveling pendant which is also a winding device. Dial, movement and case signed. Accompanied by the original mahogany fitted box, spare mainspring, hands, additional silver dial and certificate.
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Diameter: 56.7 mm
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Signed: Thomas Engel