1921 silver dollar what is it worth?

For the year 1921 two silver dollars were issued and each is a separate series of dollar coins and the designs are very different. Morgan dollars were issued from 1878 to 1904 and again in 1921, the obverse (front) of the coin has a portrait of Miss Liberty with the motto E PLURIBUS UNUM above her head, on the reverse the eagle has its wings spread out. The Peace dollar was also issued in 1921 to 1928 and 1934 & 1935 the obverse of this coin has the Word LIBERTY above Miss Liberty's head and on the reverse the eagles wings are folded and it's standing on a rock with the Word PEACE on it.

The values between the two are very different, post new question with more info.