The combat commander is a STEEL frame version of Colts commander which was a lightweight frame. The commander itself is a 4.25 in barrel version of the 1911A1. The MK IV version pictured, could be a series 70 but I bet its a series 80 which is less desirable. The 70 series has an excellent reputation, whether its actually better or not is a different story, but rep wise, it is. If its somehow a series 70, probably a buy at $650. If a series 80, a fair ask price at $650 and a bargain at $500, as others have said.