The collecting mind knows no bound. We'll chase after anything as long as its related to something we enjoy. This even includes scraps of paper for a onetime event.
Found on eBay is the below dinner invitation celebrating the 1947 2nd Annual "Brooklyn Against the World" Amateur Baseball Series. Dodgers President Branch Rickey and Brooklyn Eagle Owner/Publisher Frank D. Schroth presided over the event. The series featured a group of all star sandlot nines and equivalent squads from as far away as Montreal in a game of ball. I am unsure how long this lasted, but appears to have at least gone on well into the 50's.
(eBay Auction Link)
Checkout the pic below that I found at the Brooklyn Public Library featuring a group of players from this tournament visiting the USS Juneau in Brooklyn Navy Yard. I had initially thought this was a youth tournament, but based on this pic that appears to be wrong.(Pic Link)
Below is a advertising sign for this exact 2nd Annual tournament. It had previously sold at Leland's for $115.00 in 2001.(Pic Link)