These were produced during the 1976 US Bicenntennial, and were often mounted in nice looking bevels or pendants and sold a souvenirs. There is only one side of this thin item, and the pattern from the front shows on the back in reverse image.
The piece itself contains 2 grams of pure silver. There are 31.1 grams in a troy ounce, so 2 grams is 0.064 troy ounces. At, for instance, a silver price of $15 US dollars per troy ounce, the silver value is 0.064 x 15 = 96 US cents. Look up the current value of silver at kitco.com.
If you were to sell your token to a coin dealer or novelty shop, you would probably receive only the silver value. But there is some collector demand for Bicentennial pieces, so, approximately:
worn: silver value only
average circulated: silver value + $2
well preserved: silver + $3
fully uncirculated: silver + $8
Appealing pendants which contain this piece usually are worth somewhat more than the prices above.