Its a rare slab around the time of the Appalachian horde of Jefferson nickles. Ngc started putting either a W if the coin was blast white or a T if the coin is fully toned, the program did not last long and most of the slabs contain Jefferson nickels.
Any increase in value (eventual sales price) is due to the hype of the seller's comments and in the eyes (aesthetic response) of the potential buyer.
Don.......