1954-S Jefferson Nickel FS-501 S/D OMM -Cherrypickers' Guide Variety Major Error

Up for sale is one of the most famous and sought-after varieties in the Jefferson Nickel series: the 1954-S/D Overmintmark. This coin is listed in the Cherrypickers' Guide as FS-501 (previously FS-033). It occurred when a San Francisco "S" was punched over a Denver "D" mint mark on the die.
​Variety Details:
​Designation: FS-501 (S over D)
​Variety Type: OMM-001 (Overmintmark)
​Description: This variety is identified by the clear remains of a "D" mint mark visible underneath and inside the curves of the "S." In higher grades, the horizontal bar of the D is often visible inside the loops of the S.
​Significance: Overmintmarks like this are rare errors in US numismatics and are highly prized by variety specialists and registry set builders.