A key date is one of the hardest coins to acquire within a series. Low survival, persistent demand from set builders, and the difficulty of finding problem-free examples can matter more than age alone.
The three-part test
- Scarcity: how many exist in the grade and condition collectors want?
- Demand: how many people need it to finish a set?
- Quality: original surfaces, clear details, and problem-free condition can separate one example from the next.
Why fakes cluster here
A small change, a mint mark, digit, or doubled feature, can create a large price gap. Treat raw key dates as high-risk until the coin is verified.