Jacob & Co. Astronomia Spider 50 mm watch. Model reference: AT820.30.SP.SD.B. 18K white gold case with sapphire apertures on sides. Skeleton dial. Manual-winding movement. Blue alligator leather strap with 18K white gold 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.