The name is Healthways. It should be stamped into the side of the action? The one you have is a later model, at least mid-70's. I have three, all are Co2 powered. Two of the Plainsman 175 pistols, '58 & '70. Kinda, sorta copy of the Colt Woodsman. Also one of the rarer-than-hen's-teeth Plainsman MX175 semi-auto rifles. At least two need work to restore and/or put in new seals. Need to refinish the '58. Kinda cool is the first three digits of the serial number on the newer pistol. It's, " 007"! The rifle has a real walnut stock too! Newer pistol; Older pistol; MX175 Rifle;
I meant to infer that yours came later than the two I have. They made the Co2 pistols first for years. Your pumper is a later innovation of theirs.