64: Colt Diamondback in 22 LR Special with 4" Vented Ribbed Barrel - Man. 1969. This neat serpent gun comes in the desirable 22 LR caliber and it features an adjustable blade rear sight, a ramp front sight, a 6 shot cylinder, a deep blued finish and checkered walnut grips with a Colt medallion. The gun has been used, but it remains in very good + condition. Estimated Value: Low: $2,100 High: 2,500