How can I tell which mint made my coin?
Locating the Mint Mark
First, examine the coin closely with a magnifying glass. Mint marks are often tiny and can be worn down. Check common locations: on U.S. coins, they are typically on the obverse (front) below the date, or on the reverse (back) below the wreath or eagle.
For older or foreign coins, the mark may be in a different spot, such as near the rim or integrated into the design. If you can't find a mark, the coin may have been struck at the main mint that didn't use one.
Researching the Mint
Once you spot a potential mint mark, compare it to reference images for that coin series. Websites like PCGS CoinFacts or the Numismatic Guaranty Corporation (NGC) offer detailed guides. Coin catalogs like the 'Red Book' for U.S. coins list mint marks for each year and denomination.
If the mark is unclear, consider the coin's date and type. Some years had coins struck at multiple mints, and only certain mint marks are known for that year. For example, a 1909-S VDB Lincoln cent has an 'S' mint mark, indicating San Francisco.
- Use a magnifying glass or microscope.
- Check obverse and reverse near date, rim, or designer's initials.
- Consult online coin databases or printed catalogs.
- Compare with known examples from that year and series.
- If no mark, it's likely from the main mint (e.g., Philadelphia).
Common mistakes
- Overlooking a mint mark because it's worn or filled with dirt; a gentle cleaning may reveal it.
- Mistaking a mint mark for damage or a contact mark; mint marks are raised and part of the design.
- Assuming a coin without a visible mint mark is from Philadelphia; other mints also omitted marks in some years.
