I Found This Ring In My Backyard While Doing Gardening. After Cleaning It, It Doesn't Look Like A Normal Ring. Any Ideas?

It's a Georgian/early Victorian mourning ring. The initials belong to the lost loved one.
They were typically made from gold (18k+) and enameled in black. Yours looks like it was made around the 1820s-40s.
#10 The expandable opening for a missing fabric purse.
It apparantly was valid till the 1st of April 1922.
That sort of Money was issued in lots of communities during the times of Hyperinflation in Germany till 1924-ish.