Whew! That's a lot!
Couple of ways to do this- first, buy a paperback copy of The Gun Trader's Guide (check Amazon). That will tell you what a gun like that sold for. Last year. Or the year before. Or sometime.
The other way to to sign up on Gunbroker. Once you are a registered member, you can research COMPLETED auctions. Look not at what someone asked for, but the auctions that actually SOLD. And look at pictures, compare condition to the ones in the collection.
The value of ANY gun is based on exact make, model, condition and originality. Change any one of the 4, value changes.
What we have here is... failure- to communicate.