not as easy to tell as you might think. here is one I have attributed as the 1MM-021 as seen on coppercoins website. I cant really see you mintmak well enough to see if it is the same. the die break connecting the 9 and the MM looks like it though.
the position of your MM looks like it doesn't match the 1MM-021. I have been prompted that if it isn't an exact match, (with or without supporting die markers), it isn't the same. yours is possibly another one (of many) unlisted at coppercoins site. I have at least 9 different unlisted 1952D RPM which have not been listed there (yet).
That mint mark is in the wrong location for 021. I was looking at the wrong coin that wasn't the OP's. Sorry. But a closer view of the RPM is needed to see what is going on with your coin leonardpusher. I can't see the direction of the RPM/split from the image provided.
I still only see a regular mint mark. The line connecting the 9 and mint mark is a die crack/chip. In order to be a RPM it would be a mint mark over a mint mark with a spread or split serif. I'm not seeing this in the images provided?
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