The date boggles my mind, if accurate it is one year before the National League - and baseball as we know it today - was created.

The list of charter teams is almost familiar but with quite a bit of an uncanny valley effect:

1. Chicago White Stockings (now the Cubs).
2. Philadelphia Athletics (expelled from league, Phillies came later).
3. Boston Red Stockings (now Atlanta Braves).
4. Hartford Dark Blues (folded after just a couple of seasons).
5. New York Mutuals (expelled, the Metropolitans/Giants came later).
6. St Louis Brown Stockings (folded, the Cardinals came later).
7. Cincinnati Reds (folded, the current Reds came later).
8. Louisville Grays (folded).