Hi,
I suspect this is a common problem so this isn't a unique situation. I've been collecting for decades, concentrating on worldwide pre 1961. In the process of buying lots, albums, or improving my collection, I've ended up with "a ton" of duplicates, all off paper and in glassine envelopes by country.
I used to think, "no problem", for I could sell them on
ebay. Well, after a pretty thorough review selling stamp lots on
ebay just isn't worth the effort at all.
So what are my options? I've given up on the idea of selling them, and frankly I'm running out of room. I'm more than willing to give them away, but only to some entity that would use them.
Your help would be greatly appreciated!