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One small but challenging set is the collection of matte proof Lincoln cents. Only nine coins to the set, but finding choice coins could take some time and a lot of searching.
United States proof sets are beautiful and well-made. They represent the finest modern coinage art. Strong strikes, showing all details, with shimmering mirror-like fields and frosted devices, a proof set shows off coins at their best.
Type collectors search for one coin of each design type. A 20th century type set is popular and not that difficult to complete. A set going back to the 19th century is more challenging--and more fun--and then there is the deluxe type set, going all the way back to 1793.
I love Buffalo nickels. This is the all-American coin, with so much to offer collectors. Minted from 1913-1938, a collector can pursue a basic date-and-mintmark set in any condition. A set in high grade is a challenge, and a set with well-struck coins can prove more challenging. And then there are the proofs.