Mercury Dime Key Dates
1916-D This is the low-mintage, key-date coin sought after by many collectors. Occasionally, very worn examples can be found in "junk silver" Mercury dimes. Counterfeits (or altered 1916 Philadelphia coins) are common enough that collectors often consider encapsulated, graded, and authenticated examples for their collections.
1921, 1921-D Both the Philadelphia Mint and the Denver Mint struck Mercury Dimes in 1921, but each facility's mintages were barely over a million coins each, making both "better date" issues. Coins from before 1921 struck at branch mints also have captured the attention of collectors and often do command "semi-key" premiums.
Mercury Dime Proofs
These coins were struck for only seven years from 1936-1942. The respective mintages get larger every year from a 1936 low of only 4,130 to a 1942 high of 22,329 (still quite a low number), when production was halted due to the United States entering WWII. A Mercury dime proof collection is often considered a cohesive, achievable numismatic goal.
1942/1, 1942/1-D This overdate is one of the better-known die errors. This Mercury Dime is often sought by error collectors and students of the series and was struck at two mints. Raw examples are periodically found in "junk silver" bulk Mercury dimes today, despite discovering the error shortly after its release in 1942.
1945 FB/FSB This is one of the lower mintage coins in the series that has captured serious collectors' attention. Higher graded Mint State examples with the designation are tough to find.
1945-S "Micro S" The San Francisco Mint produced dimes with two different sized mint marks in 1945: the common, standard-sized "S" mintmark and the more desirable "Micro S."