Any Jefferson nickel experts out there? I need help...

Gemini

I found a 1975-P mint nickel and suspect the planchet might be foreign. It is half the thickness of a regular nickel and slightly smaller.
The coin does has full mint luster but appears worn out due to the very weak strike.
Jeffersons head is very weak and E PL are the only letters showing above Monticello and the building itself is very flat in the central portion.
Most of the outer lettering runs right up to the edge of the coin.

A Coin World article from Sept 9 1981 mentions that the San Francisco Assay Office struck 2,000,000 nickels for Liberia in 1975.
The article also showed the same nickel identical to mine only with a D mint mark. It also mentioned possibly Denver punched them out for San Francisco and one of the blanks accidently found its way into to the Denver nickel bin. Or maybe it could also have been struck on a thin rolled planchet but they didn't seem to think so.
Now I have the exact looking nickel with a P mint mark.
Are thin rolled nickels or foreign planchets fairly common?
Do any of the grading services authenticate something like this?
Any guess on value or rarity if this happens to be a Liberian planchet?

Thanks
Don-gemini

RGL

The weight and thickness, and whether they match up with the Liberian nickel, will be the key ... ANACS likely the best choice if you want to attempt authentication, but I would enclose a note explaining your suspicions ... wrong planchet errors are neat!

Monstavet

Sound like an interesting coin. I agree with RGL, send it to ANACS. Let us know what you learn!

cladking

If the coin looks like it has a mint mark then it was probably made in Denver.

Gemini

There is no mint mark present and the metal composition I understand is the same for both the Liberian and US planchets 75 percent copper and 25 percent nickel.
Thanks guys for your help I will send it off to ANACS and let you know what happens.