Sorry but,unfortunately,your coin is a COPY/REPLICA of an extremely valuable american old coin,known to exist today only in one piece(=unique). This is what reputable coin catalogs (like KM) say.
So, it is very unlikely that you have the SECOND piece on Earth... But,even 0.01% chances would have existed that such a numismatic event realy happens, let's look closer at your coin! It has a crude appearence,very different (please,compare for yourself!) to the (unique) piece shown in KM catalog & that I send you bellow. If made of silver(as you suppose) your coin's value can be: its silver weight bullion value + a few dollars more,as a copy of an UNIQUE coin. That's all! If not even made of real silver,the value goes down to almost nothing!
To check if your coin is silver made or, perhaps,only silver plated (another possibility), please go and show your coin to a jeweler. He will surely give you the correct answer! This cannot be done just from photos!
P.S.: In the photo that follows,your coin is ment to be the denomination US 1000 (Mark).