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This series first achieved fame because of the mint errors. Leaving the mintmark off of some of the 1968, 1970 and 1975 proof dimes led to a constant check (and recheck) of every set. Then it happened again in 1983! While this set started out as a clad-only series, it is now sprinkled with silver coins (beginning in 1992).
Notes: This set has bonuses. Please see the Set Composition for a listing.