Just WOW another nice find from my CRH nickel hoard it's hard to tell but the scratch in the (U)is visible. http://varietyvista.com/05 JN RPMs/1954SOMM001.htm
The scratch appears to be there so more likely to be stage A. Can you get shots of the die scratches upper left and right of Monticello
Looks to be past that point now. A rinse in acetone put in a flip or folder. Write down it's attributes and enjoy it