1940 Jefferson Nickel. FS-901. Reverse of 1938. Proof-68 (NGC).This is a breathtakingly beautiful example of a rare and conditionally challenging hub variety. Lovely bright silver surfaces are untoned save for the lightest iridescent gold highlights that are not readily evident at all viewing angles. Otherwise brilliant in finish, we note subtle frosting to the central devices that provides some measure of cameo contrast as the coin rotates under a light. Virtually pristine, as befits the assigned grade, and sure to please even the most discerning bidder.pOf the 14,158 Proof nickels struck in the Mint in 1940, the vast majority are of the Reverse of 1940 hub variety. A small percentage of examples were produced using the old Reverse of 1938 hub, however, attributable by the softly defined (as made) steps leading up to the entrance of Monticello. Writing in the 2015 edition of the popular emCherrypickers Guide to Rare Die Varieties of United States Coins/em, Bill Fivaz and J.T. Stanton describe the Proof 1940 Reverse of 1938 as "an extremely rare variety." As one of the finest examples known to the major third party certification services, this outstanding Superb Gem offers both absolute and condition rarity that would do justice to an advanced Jefferson nickel set.