Jo,
For memorabilia items, at the top of this page is a tab called "Memorabilia Forum". I would go there for that Joe D. signature. I would definitely get it looked at again but no idea who. The guys on the Memorabilia side would certainly help you.
The rest of us, I am sure, would love details on the cards and items you might have as well. Scans or pictures are always fun too.
Joshua
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