Adolph A. Weinman's Winged Liberty Head or "Mercury" Dime debuted in 1916 during the era in which the United States introduced some of its most impressive coinage designs. Indeed, this is probably the most popular of all U.S. Dime series, and it has a very strong following among both Registry Set collectors and numismatists on a stricter budget. As such, investors should focus on this series as one that is likely to perform very well in coming decades. The rarest issues of this type are the first-year 1916-D, 1921 and 1921-D. The final-year 1945 is the key to a Full Bands set, and the 1942/1 and 1942/1-D overdates are scarce-to-rare varieties that are always near the top of collectors' want lists.