I feel like I opened the refrigerator door and my wife said "hey grab a T206" and it HAS to be right in front of me but I don't see it?
Beautiful display! Some random thoughts in case you want to add:
one T206 (I think a Snodgrass with the catchers gear be "interesting")
one of these: E90, E92, E93, E94, E95, E96, E97, E98 (pick a colorful one maybe from E93 or E94 to contrast what you've already got)
one M101-2 Sporting News Supplement (sepia toned)
And there are some beautiful postcards - browse this site -
https://oldcardboard.com/cardSetList.asp?GroupID=12
Bakery cards:
https://oldcardboard.com/cardSetList.asp?GroupID=13
Good luck, and please update with pics when you add to it!
Rob
edited to add: looks like everyone already mentioned what I was thinking while I took too long to respond, doh!