I'm long-time NMLRA . . .maybe I can help....
If it's been converted, it doesn't have a lot of collector value. It's hard (as with any rifle) to put a value on in sight-unseen, or without more data. Offhand, it sounds a little high if all you want is a wall hanger. If you want, I can point you toward resources that could tell you more....let me know. And btw...drop a ramrod down the bore before you start fussing with it...some of those old ones were left loaded, and they'll go off after 50 years.