Swiss gold interesting complicated pocket watch Circa 1983

Gold open faced watch made for Zenith
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A Swiss 18 carat pink gold open faced keywinding pocket watch made by Thomas Engel in Luzern, circa 1983. An engine turned case back made by E. & C. Nardin, La Chaux-de-Fonds. A screwed case back, glazed cuvette, ball-type swivelling pendant acting also as a winding device, subsidiary seconds at 6 and two horological complications: Half-instantaneous day of the week, subsidiary dial at 2:30; indications given in French. Phases of the moon, aperture at 6 o’clock. Metallic thermometer according to the Celsius scale calibrated from 5 to 30 degrees, sector at 9:30; not considered as a horological complication.
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Silver engine turned dial, with radial roman numerals and blued steel Breguet hands.
A rhodium plated movement, going barrel, straight line lever escapement, monometallic screw balance, self compensating flat hairspring with terminal curve, polished steel index regulator with swanneck spring and micrometric screw, adjusted in five positions. Signature on the case, dial and movement.
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Diameter: 50 mm
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Weight: 129 g
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Signed: Thomas Engel, Luzern
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Accompanied by the original fitted box, certificate of origin dated May 8, 1984, Bulletin de marche
(Watch rate certificate) from C.O.S.C., La Chaux-de-Fonds and Le Locle, No. 22 606 (dated December 16, 1983)
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Engel, Thomas (1927-2015)
Professor Thomas Engel is known worldwide for his research in the production of polymers. In 1966, he developed a process for cross-linking plastic extrusions, particularly those of cross-linked polyethene. Based on the reaction of plastics at pressures of 15 000 to 150 000 psi and temperatures of approximately 300° and the presence of a peroxide catalyst, a cross-linking agent, this process was a significant step forward in plastics technology. It resulted in the production of a high molecular weight product with improved heat and chemical resistance, which is still in use nearly thirty years later.
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Professor-Doctor Engel has received numerous prizes and honours. When not inventing, Thomas Engel pursues his great love of horology, with particular emphasis on the life and work of Abraham-Louis Breguet. Not just a collector, he has applied his knowledge and technical skill to the art of watchmaking. Over the years, Engel has produced a few watches in the style of, and often with the methods of, Breguet.