a silver coin contains 90% silver and this coin does contain 90% silver therefore it is a silver dollar. Mint mark doesn't matter, as I have taken it to a coin dealer to confirm that it is truly a 90% silver. Thank you for your concern and I hope this helps.
This is a 1972 Philadelphia minted Eisenhower dollar. Its easy to look up the value on this. The city it was minted in will tell you whether it has silver in it or not. You can also look at the edge of the coin. if it doesn't show any sign of copper, than it has silver in it.