Posted By:
ramramJimmy L. may actually be right when he says muffin nine (lower level teams within the social club). These clubs had many members and it doesn't sound like this is the top team (although the Knickerbockers chose to remain more of a social club than to become a competitive team like many other teams did throughout the 1860's).
I'd say send it to auction. That's the only way for it to be accepted as the real deal. We can't help very much without seeing it.
Rob M.