I saw an Colt Cobra .22 caliber revolver today in NIB condition! Were these common in .22 caliber? Or, were these rare? I checked www.proofhouse.com and the serial number of C990XX was shown as being made in 1970. Is this Cobra .22(Without the ejector rod shroud)a reasonably good Colt revolver to collect? What type of Colt box should this Cobra .22 have been shipped in from Colt's? Thanks!