Jacob & Co. Astronomia Tourbillon Black Gold 50 mm watch. Model reference: AT100.31.AC.SD.A. 18K white gold case with black DLC coating. Skeleton dial. Manual-winding movement. Black alligator leather strap with folding clasp. Swiss made. The watch comes in the original packaging, with a set of documents and 2 years warranty. At Modern Wrist we offer new authentic watches at the best prices.