More of an issue with a damaged mint mark punch. Not a RPM. There were two different mint mark punches used that year. MMS-002 and MMS-004.
You can see a damaged punched used on the 1951-S and the 1952-S on the PCGS coin facts page. There are examples of normal MMS-002 and bent punches used on both years. Check it out and see:
http://www.PCGScoinfacts.com/CoinIm....aspx?s=5099
http://www.PCGScoinfacts.com/CoinIm....aspx?s=5102

You can see a damaged punched used on the 1951-S and the 1952-S on the PCGS coin facts page. There are examples of normal MMS-002 and bent punches used on both years. Check it out and see:
http://www.PCGScoinfacts.com/CoinIm....aspx?s=5099
http://www.PCGScoinfacts.com/CoinIm....aspx?s=5102

Edited by coop
12/26/2018 1:28 pm
12/26/2018 1:28 pm























