NGC 5c 1976-S proof Jefferson nickel with a cud obverse at 5 o'clock. The cud is large for a proof coin, with all proof cuds on Jefferson nickels being rare, and with few known. This particular cud...

NGC 1976-S proof Jefferson nickel with a cud major die break at 5 o'clock on the obverse. The cud is obvious and is scarce because it is on a proof coin. Proof coins are carefully examined for cuds,...

1976-S 5c Proof Jefferson Nickel Cud Major Die Break. Scarce.  PF69 Ultra Cameo Note: some minor scratches on the holder, but they are not on the coin. 

NGC 1977-S proof Jefferson nickel clashed dies obverse and reverse. The strongest clash marks are on the reverse, but the coin also has obvious clash marks on the obverse. PF67 Ultra Cameo

NGC 1972-S proof Jefferson nickel with a cud as the base of Jefferson's bust. The cud, also known as a "major die break", occurred when a piece of the die adjoining the coin's rim broke and fell away...