Sounds like a #1B that someone replaced the forearm from an A or S and put a barrel band on the barrel. I've thought about doing that on a #1B I have in 30-06 but just never got around to doing it. I have never figures out whay the #1S was so dan hard to find. I ordered one though my LGS and the the distributor sent a B. When I conplained at my LGS, the bos called the distributor so I could complain. I was told that was the only one they could get do take it or send it back. I still have it. In all the time Ruger has brought out the #1, I have only seen five of the S model. One I turned down because I do not like the .338 Win. Mag, another was so beat up I'd have had to send it back to Ruger for a complete restoration. I bought the other three. All are in .300 Win. Mag. with two being Liberty models. The last one I bought was a black pad, again in .300 Win. mag. and it's my favorite Ruger #1. I love my Ruger #1s.
Paul B.
