Silver coins can and some do get RPM's. As you might already know an RPM is when a mint mark is struck twice which can result in "doubling" of the mint mark. From what I can see the 1953 and 1962 look like they have RPMs. The other coin looks like it might have Post Mint Damage where something could have struck the coin which could make the Mint Mark look like an RPM. That is just my opinon as I could be wrong as I don't do that much of the RPM errors, But I do a lot of error coin collecting and searching. Jimmbob82