Some say never clean any coin.. I say if it is not a valuable coin then clean away! I have used Baking Soda on the majority of my metal detected silver. Especially the Silver War Nickels. That's just my humble opinion.
I don't think this question has ever been raised here. For the war nickels, was the mintmark punched into the working die by hand or was it incorporated into the master die? I don't recall ever seeing a war nickel with a mintmark repunched or misplaced.
There are lots of listed RPMs. I don’t know of any misplaced mint marks though. http://varietyvista.com/05 JN RPMs/RPM Listings.htm
Paddyman I gave you the benefit of the doubt when you said the word "interesting" but now you have gone and redeemed yourself when once again you burst my bubble. Nice work sir. I salute you
How much do you think I could get for these 3 20 pound gold bars I have stashed away? They all have Fort Knox stamped in the wrong place on the face of them