These kinds of questions are always interesting, because the poster doesn't say HOW they purchased it or what they paid. Therefore, the question is actually unclear.
Is this buyer's remorse?
Was it bought at a tag sale for a quarter?
Did it come from an antique shop, with a retail price?
There are collectors of coronation memorabilia, but its so plentiful that the items really aren't worth a lot. If you want to see what people will pay for them, when exposed to an audience of hundreds of thousands:
http://snurl.com/2cei