To identify a specific coin, you can use these major databases and references: How to Read Roman Imperial Coins-and what we get from them
High-value coins, often featuring refined portraits of the Emperor. Roman Imperial Coins
Includes the Sestertius (large), Dupondius (medium), and As (small). To identify a specific coin, you can use
Latin inscriptions around the edge that list the Emperor's name and titles. 3. Reading Coin Legends To identify a specific coin
Roman currency was based on a system of gold, silver, and bronze/copper.