Up for sale is a pair of Chronomaster Aviator Sea Divers The Chronomaster can be found branded with Croton, Nivada, Nivada Grenchen, and even Croton Nivada Grenchen. There were a boat load of variations made over the years it was produced. There were also a large variety of different movements to be found in the Chronomasters. The best would have to be the venerable Valjoux 23 column wheel movement, which was also found in chronographs from Heuer, Rolex and other higher-end Swiss brands. Nivada: All original Nivada signed back plate and crown as well Nice patina Val 23 movement $1299 Croton: Bezel looks like a replacement Hands are original for this later model watch Nice patina Val 23 Movement $999 Both watches run strong. Price includes free shipping CONUS, international please add. No Returns. Face 2 Face available in NYC.