You have one of the variations of Marlin 1895 - the G, GS, S, Cowboy, or Guide Gun. The value depends on which model you have and who you can find to buy it. The prices run from $400 to $700.
The 45/70 is best kept in the 0-150 yard range out of a lever gun.
Gun Trader's Guide book.
Unknown.
Try gun shows, libraries, gun shops, want ads, e-gunparts.com
Try e-gunparts.com, gun shops, gun shows, want ads.
This gun was manufactured between 1954-67. If you want to get it repaired go to the Crosman home page and click on "Find a service center" It will guide you to a repair location. See the related link.
Yes, you can buy a gun case for anyone.
You will have to figure out what model it is first. If it is a really old gun, try to identify it from Flayerman's Guide to Antique American Firearms and if it is modern look in Gun Trader's Guide. Both of these books should be available at your local library.
value of featherweight model 12 winchester serial #795 12 v
put the gun in the case! :P
its in the unfinished shop in the north plaza, you find it when you go and do case 5-1