Use the respected references
Many major U.S. series have already received decades of careful study. This site should explain the basics, identify reliable attribution systems, and link collectors directly to the specialists.
Coins, Tokens & Medals
Die Varieties
A gateway to established attribution systems, diagnostic features, and specialist research.
Attribution workflow
Confirm date and mint, inspect major design features, compare die markers, account for die state and wear, and seek specialist confirmation when the identification affects value.