I'm not sure how to classify this 1946-D nickel. Sorry for the poor photos, that's all I can do at the moment.
OK I think I know what this is.... After staring at this thing at 200X for a while, I think I've figured out what it is. See attached pictures.
I think it is RPM-005 It looks very close to the coin in this picture. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370296421325