When the Agency I was with many moons ago began furnishing service revolvers (prior each officer was required to furnish his own) it was Model 64s. In a short time the issue went to Model 64 H.B.s. I was last in line so I was issued a first issue pre-owned Model 64 pencil barrel. I was disappointed until qualifications. That pencil barrel was a "Tack Driver" and shot better scores then the newer H.Bs. I NEVER requested a newer H.B. Model 64 as I was a HAPPY CAMPER !