My 24th edition of "Blue Book of Gun Values", which is several years old, indicates that at 100% (as NIB) would be $555. 98% is listed @ $450. These are book values only, and as always, price is based on what the market will bear, as well as your individual "gotta have it" needs.
Chances are that as time goes by, that rifle will do nothing but continue to rise in value. Any chance you can get the original factory box and paperwork with it? It would be worth checking out............ Good luck....