What is a mint mark on a coin?
Definition and Purpose
A mint mark is a letter, symbol, or group of letters placed on a coin by the mint that produced it. It indicates the specific mint facility—such as Philadelphia, Denver, or San Francisco in the United States—where the coin was struck.
Mint marks were introduced to track production and quality control across multiple mints. Today, they are a key way collectors distinguish coins that may look identical but have different values due to mintages or historical significance.
Examples of Mint Marks
In the U.S., common mint marks include 'P' for Philadelphia, 'D' for Denver, 'S' for San Francisco, and 'W' for West Point. Other countries use their own systems; for example, Canada uses a 'C' for Ottawa and a 'W' for Winnipeg on some coins.
Some mints use symbols instead of letters. For instance, the British Royal Mint has used a small 'B' or a tower symbol, while ancient coins often used city symbols or monograms.
- P – Philadelphia
- D – Denver
- S – San Francisco
- W – West Point
- O – New Orleans (historical)
- CC – Carson City (historical)
Common mistakes
- Thinking a mint mark is the same as a designer's initials or a privy mark; they serve different purposes.
- Assuming all coins have mint marks; many do not, especially those struck at the main mint.
- Confusing mint marks with date or denomination numbers; they are separate elements.
