This is a Colt Diamondback revolver in .38 Special caliber. It is blue steel and has a four inch barrel. The Diamondback model was made as a small size Python to be in 38 special instead of the Python 357 magnum caliber. The lockwork is as smooth as a Python. It comes with the original Colt grips and has a red ramp on the front sight and adjustable rear sights. The serial number is NO78xx indicating it was made in 1977. Condition is 98% Add $19 for shipping and insurance.