Here's a different Baseball Centennial FDC (it's currently on
ebay if anyone might be interested.)
You can find many of the Scott 855 FDC, there, but rather than have one of the mass produced printed cachets, this one has one that looks like the type of rubber stamp cachets found on Naval and First Flight covers.
Unlike the rest of these you see, this one has a large circular date stamp from Cooperstown rather than the usual First Day Of Issue machine slogan. Makes me wonder if it was created locally by someone with connections at the Cooperstown post office.

