You have a 'silver round' which is a piece of pure silver minted into the shape of a coin. It is worth its weight in silver. Since it contains one troy ounce of silver you can easily look up the price at any precious metal site. My favorite is Kitco.com. Look it up now. The price changes every day.
Some fradulent eBay sellers like to advertise 'silver rounds' that are, in fact, only clad in silver. These are worthless. As always, only buy from sellers that you trust when it comes to precious metals.