I saw an older NIB Colt Cobra revolver in .22 caliber in a 3-inch barrel today, and I would like to know if this gun would have much collectibility? It does not have the shrouded ejector rod-and, this Cobra was made in 1970! Also, I would like to know if it might be considered somewhat rare-or, if these were just common guns? Please state your reasons and clarify this? Thanks!