1964 D Nickel RPM/Omm #3?

It is Machine Doubling. Note the affected area is all the same height on the mint mark. It is flat shelf like. If it was a RPM, then the devices would be raised, not lower than the mint mark.


If this were a legit item, it would have been called a RPM. (Re-Punched-Mintmark) That would designate it was a D/D punch. (which the OPs coin is not)
If it would be a OMM, then it would be a mint mark over another different mint mark. (Over-Mint-Mark) The example I posted above is a OMM. It is a Denver punch over a San Francisco mint mark punch. Note again that the punching would be raised above the field like the added punch mark. They would be raised and visible.

Actually the mint mark punch is used several times on the die to get the correct depth. It is the Miss alignment of the mint mark that causes the RPMs. Some RPM mint marks has several punches on them.

It depends on how high/direction the die bounces. Sometimes mint marks are taller than other devices. We often see this on quarters that the mint mark is affected, when all the devices are around that area are not touched. Other times, with less bounce, the many of the devices are affected. So direction of the bounce and height make a difference. I would like the to see the area to the left on the building to see if that is affected by Machine Doubling. There is a an area just out of range that often shows contact on a vertical part of the building.

On the pre 1989 (hand punched) coins, the punches usually went into the dies deeper than the other devices. Being the highest device on the coin often made them the only device to exhibit Strike Doubling because of high die bounces.
What tipped me on your coin was the reduction of the size of the mint mark. On a RPM the last punch is generally not reduced.
If the "doubling" on a reduced device is flat and shelf like, it's Strike Doubling, otherwise it's die wear.

sorry to use this topics for some question..its just cant post a new one with my account..so a friend of mine gave me this last night I'm not really sure if its in ms state and the sad thing is we dont have PCGS NGC or anacs here in the philippines..so can anyone of you can tell the grade of this coin according to the photos below?

thats make sense..thank you man atleast I have an idea..thanks again

by the way does it looks like rpm?

When you look closer at the mint mark area, you will note not just the reduction, n
But metal movement on the mint mark area:

Note how the direction moves the MM? A RPM is not metal movement, from the mint mark incorrectly punched into the die. The difference? The die striking the coin with the RPM on the de. MD causes damage to a struck device after the strike happened. One is a die variety, the other is machine damage to the coin.