What is an 1822 dime worth?

Answer 1

This is completely defendant upon the authenticity and condition of the coin, and the state of the rare coin market when and where you decide to sell it. It is fair to say that an authentic 1822 dime is worth substantially more than a typical date of that dime series at a similar level of preservation, by a factor of at least ten fold.

Coins are like collectible cars, in the sense that the value is mostly determined by tastes, surviving examples, popularity, and whether or not the vehicle is showroom fresh or has been wrapped around a tree.