1776 -1976 halfdollars

I have a 1776-1976 Eisenhower silver dollar. Is it worth more than $1?

I have a 1776-1976 half dollar, there is no "S" or any other letter on the front. There is a marking at the base of the neck, just above the "w" in we. On the back there are 3 letters "SGH". Is this of any significance?

i have a coin that has 1776,1976 in the front and in the back it says E PLURBUS UNUM

My in-laws have this coin that they think is rare, so I'd like to know if it really is... The coin/ medal is larger than a quarter and is copper (?) clad... It has what appears to be the liberty bell on one side and states "United States of America- Bicentennial"... On the other side it states...

It is a silver dollar. On the back is the liberty bell with two stars