COLLECTORS THRIVE on set completion, and many 20th century series are relatively easy to complete. For example, if you consider completion as having one of each date/mintmark combination, without major varieties, then you’ll have little difficulty assembling complete sets of Buffalo and Jefferson nickels, Roosevelt dimes, Peace dollars, and so on. The same is true for Walking Liberty half dollars, Franklin half dollars, Kennedy half dollars, and Eisenhower(Ike) dollars.
It’s true that most of the series I listed have key coins, coins with relatively low mintages and often prices that are multiples of those for other coins in the series. As just one example, look at Peace dollars. With a mintage of only 360,649 pieces, the 1928 (P) has been a tough coin from the day it was issued, and…
