1939 Reverse of 40 Proof Jeffersom in Pr.-66 in proof 65 it's a $350. Coin. In . Proof 66 it's a $ 900. PRDC 66 it's $7500. And in Proof 67 it is $3550. I picked this one up around 15 years ago..... I was working on my Jefferson proof Registery set how much did I pay?......
I’m guessing it was raw when you found it? I’ll say $59 From a dealer that thought it was just a common proof nickel.