A.G. Spalding & said to be Cap Anson I believe, player in Chicago uniform, on the front.
Looks to be blank backed, even though on the front there is a little icon on the lower right that says "members of the Chicago Baseball Team". So bit of a mystery why this is blank backed.
I held it up to the light and no players show through.
A one-off? A prototype? A very neat & rare item none-the-less.
Video on YouTube on these:
https://www.youtube.com/watch?v=aSz_fGxKwnM
$700 or best offer shipped (Check or Paypal F&F preferred)