I picked up a project Highway Patrolman recently, S1758XX, with GSP stamp (Georgia State Patrol) on the frame and a factory butt swivel. a 4 screw, and not model marked.
Its certainly seen its share of use along the way with a cut down barrel - number marked cylinder face, some S&W factory rework stamps on the butt frame, at least one reblue. There is some pitting in places where it seems the gun probably sat neglected for a while.
I have seen the GSP commemorative m26, but haven't seen a gsp hp before? Anybody have any background on the use of the Highway Patrolman and the GSP - or share a picture of yours?
I think its a pretty cool gun, and am going to try and refurbish it a bit.