Hello, Came across this Nickel and wasn't sure if Nickels had composition problems like some of the cents out there. Thanks.
I have seen wood-grain type toning on Jeffersons -- long, streaky toning. But I don't know that I've ever seen it because of an alloy issue. I guess the closest equivalent would be the 1958-1959 "Black beauties." These coins had a little different alloy composition, and tended to be very dark.