I just bought a model 10-5 SW with bo-mar rib and sights, It has a NATIONAL POLICE SUPPLY barrel, buy the serial # it was mfg. in 1977 purchased in N.C. Can someone guess who might have made this pistol and what is the value of it as a 85% gun or is there a collector value in it? It also came with a open front holster stamped RENO OKEECHOBEE, FLA. Any input would be appreciated, thanks Geraldo