I'm going to go at your question from a slightly different angle.
I am going to assume that the sheet(s) you want to display are going to give you more satisfaction from them being displayed, than from potential resale value in 50 years.
If my assumption is valid, than a google search for "poster display hangers" turns up lots of options.
http://www.allposterframes.com/all-p...me.asp?ID=5242
http://www.displays2go.com/Product.aspx?ID=13740
I wouldn't suggest using these for your 1952 Topps high number sheet, but your 1985 Topps sheets would look pretty cool.
Doug