This coin is oxidized and with the fancy lettering I just can't make out the name of the state. The date is 1920 and it says "Stadt ---" I have many guesses at what some of the letters are but I just can't put it together. I think the first letter is a B and it might start "Bech" but it might not.
try pressing a bit of aluminum foil over the coin. Press into the recesses of the letters. I believe that the first word is "Stadt" and the second word ends in "en"