1913 C.g Brinker "Souvenir" Slug J213?

Looks like you pretty much hit the nail on the head. I wasn't expecting much when looking it up, but it was listed alternatively as R7 or R8 in terms of rarity, indicating roughly 100 or fewer known examples. That would make this token quite valuable, but only within a VERY niche market.

NGC will certify your token, which can help if you plan to sell it, or whether you would prefer it slabbed in your collection. I would do a bit more research, as tokens of this rarity will likely draw counterfeits.