Question: are there any rare dimes?
Answer: Winged Liberty Head dimes, also known as Mercury dimes, are highly scarce. They do, however, turn up from time to time in circulation. There are a few rare business strikes, such as the 1916-D, 1921, and 1921-D. There are also some other scarce varieties, including the 1942/1 and 1942/1-D overdates.