Old Silver Coin. German States???

Too worn out for me to identify. Tried looking in the Krause book 1801-1900.
No luck though. It maybe be older, but I don't have a 1701-1800 book.
Help!

 

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sorry but the coin is to badly worrn to make a proper id

 

The design, what is visible, looks very familiar to me.
Kinda like a word on the tip of your tongue, but you can't get it out.
I want to say it is early 1900s.

 

Inscription reads on the Obv side: "F.C.S.R.E.I (or P).C.DE. RODI(?).E.CONSTAN.8.R.I.P."
And on the Rev side: "24 EI_____EN" then there is a "G" mint mark on the very bottom.

 

Germany-Bishopric of Constance 1/24 Thaler. One year type of 1772.