The listing, Lot of 3 ERROR RPM 1954 s/s 5c & 2 1c 1959 d/d 1960 drastic d/d with obverse doubling & bonus! has ended.
Rpm's are re punched mintmarks.
Although technically the same as omm, over mint marks, they are in totally different classes. Omm are the famous d/s and s/d
In both, a die is hand punched with the mintmark. And for various reasons, they strike it again, but are not perfectly lined up
First is a 1954s/s nickel. A bit tough to see this one, but it's there to the left, west, of main mintmark
Then is a 1959 d/d west, that's pretty clear
Next pic is of the bonus, 1960d large date with filled r of Liberty
And the prize is the 1960 d/d with quite a bit of doubling. Believe it's machine doubling.
This rpm is drastic. A very nice example of the d/d rpm, and doubling to boot!