With all that said, I found this 1952d LWC that I haven't been able to rule out of having a RPM. Nor can I seem to find enough evidence to prove that it is. So once again I pose a coin to the experts here to help me identify, or explain to me possibly why it cannot be ruled one way or the other. Looking at http://varietyvista.com/02a LC RPMs Vol 1/RPMs 1952D.htm and considering the shape and position of the mint mark I think it may be 1952-D RPM-021 or 1952-D RPM-023. However I can't seem to spot any of the die markers on the coin. Possibly due to the wear on the coin, or my inexperience in looking for them, or maybe the fact that they just never were there. Any advice here is much appreciated. Both advice on this coin, and advice in general for looking for such things. I have been concentrating on LWC for the time being since I have a lot of them readily available and I understand that when learning to search for these it is better to concentrate on one coin type so that you become very familiar with every aspect of that type an it will be easier to spot errors when you find them.