Rare Colt Diamondback .22LR, Electroless Nickel finish. I obtained this firearm in 1989. In April 1990 I had enough to Letter it from Colt. It came back as COLT DIAMONDBACK REVOLVER SERIAL NUMBER: S##### CALIBER: .22/c BARREL LENGTH: 6" FINISH: ELECTROLESS NICKEL TYPE OF STOCKS: NOT LISTED...