Originally Posted by S&WIowegan

Your pictures clearly show the pin that secures the barrel to the frame is buggered notably. If the pin was removed, the barrel was probably changed. Neither 25-2 or 25-5s normally have a red insert in the front sight. If you lettered the gun you'd probably find the gun left the factory with a 6 1/2" barrel and Patridge front sight. Someone later on switched the barrel to 45 Colt. The cylinder has probably been changed to 45 Colt or reamed to accept 45 Colt cartridges.

The gun is a homemade shooter, not a valuable "one-of-a-kind"gun.