Thanks for contributing. You asked about the RPM. Yeah, It's an RPM, but it's not the RPM-008 shown on the coneca info you posted. (Thanks) The voyage continues. Good day.
A few last words, -1944-P- Hub doubled doubled die. Too much uncertainty. Too many unanswered questions. I decided to seek another opinion from NCADD attributer Brian. He said. . . . wait, you can read it for yourself. 1944-D Master die doubling huh. Must be a million of em. Gem Unc, early die stage/state, and great tone may make this a condition rarity. B . .
You need an expert to have a look. The die cracks match the description but appear to be from an earlier die state because they are not as long.
ONE last WORD--- This is a case of master die doubling present on virtually all 1944 P,D &S nickels, according to Brian Ribar, NCADD's attributer for DD nickels. This is a particularly good early die stage/state example. Bone Head