This post is coming late but I hope that you have done nothing to modify / refinish your Springfield. Springfield manufactured a sporter version of the
Springfield Rifle for a short time that looked like the rifle you have. They had I believe a Lyman Model 48 rear sight on the rear receiver bridge. Springfield was stopped from making these because the government was in competition with private industry, not an acceptable thing. Not many of these were produced but they did have star gauged barrels. In any condition these are highly desirable; but unmodified and in excellent condition they bringing prices from a collector that are out of sight. Someone in an earlier thread mentioned $7,000 and I would agree with that or more. UNMODIFIED MEANS ORIGINAL FINISH ON THE STOCK!!! Refinishing the stock could literally cost thousands in value. The only thing you should do this rifle is keep it clean, keep it oiled down and don't "ding" the stock or metal. The next thing is to go on line and Google Springfield Sporters and researcch them. You should be able find out all the information on your rifle to correctly identify it. Sonewhere there is probably a list of serial numbers that that Springfield Armory used in the production of the sporters.
Another very collectable Springfield is the T model or Target. Very few people are aware that Springfield even produced such a model. Today the ongoing "craze" seems to center more on modern military weapons like M16's, M1's, ak's sks's, etc., and that is understandable. But campare the quality of manufacture of a "Springfield" Springfield Rifle, work the bolt, look at the quality machine parts and then compare them to the stampings and castings and cost saving measure used in modern military firearms you will get a real appreciation for the former. This in no way is intended to condem modern military firearms and there are a lot of coutom builders that are making them into super firearms with tack driving accuracy. This is like compaing classical to contemoprary, each has its proponents and some like them all.