In 1979 the U.S. Mint struck the 1979-S Proof Jefferson Nickel with two different mint marks. The Type 1 mint mark is less clear and is also referred to as a filled s mint mark. The Type 2 1979-S Proof Jefferson Nickel has a clearer s mint mark and is referred to as a clear s mint mark. Both varieties are very collectible and very popular with Proof Jefferson Nickel collectors.
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