1941 Silver Nickel Struck On 1942 Wartime Plant?

I've done a ton of research on this coin & have yet to find anything matching it. However, what I do know is:

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- It's silver
- It's a 1941/42.....Or at least that's the impression I got from the 2 that's located underneath the date, between the 4&1.

- Wartime mint mark located just below the Monticello steps. At least it appears to be a "large "D" mint mark", the same found on the 1942-1945 Wartime nickels.

And furthermore, it appears to be a RPM. Magnified x10 and D/S/P becomes easily visible and......

.....Well, that's all I have.

Any ideas? If so, please comment & share. Your advice is greatly appreciated.

#Me? just an amateur trying to learn