As we all know, the Highway Patrolman was only manufactured with either a 4" or 6" bbl., and the Baughman-style front sight did not have a colored insert. If this revolver is indeed an early Highway Patrolman, the barrel must have been swapped out for a 3-1/2" .357 Magnum barrel. But why then is the barrel matte finished instead of gloss blue? If there are no serrations on the top strap of the barrel, then perhaps the 4" or 6" barrel was shortened? Whichever is the case, IMO the revolver is still worth $1K- especially with the GSP provenance. The closest s/n I have is a 4-screw .44 Magnum (shipped 1958), s/n S177963. But since all N-frame revolver models were mixed within the s/n ranges, we'll have to wait for some additional information from Stinxx.