I don't have any ideas what it is but it sure is a cool find. Doesn't appear to have a date on it.
What did it ring up as on your detector?
Imaging if it was a $50,000 mortgage coin?
an advertising token for that bank in Fostoria, OH. Given that their capital was only 50,000 dollars (but advertised there as a sign of financial strength), and the little swirly designs on the back of the token, leads me to believe that it dates probably somewhere around 1910 to 1915 or so. I don't see one listed on the token database ( TokenCatalog.com ) If you've never used the site, it's a wealth of information for anyone interested in tokens. No doubt they would love to add pics of yours
Rang up 12 48 on the CTX. The lettering side was gilded with something that looks like gold but can only be seen at a angle. I am imagining all kinds of things that is why I am hoping for a good ID.