PREVIEW – Check the schedule to find the next rare coin auction. However, a coin with no mintmark can be special when this mintmark was left off by accident rather than on purpose. This is normal and rarely adds value given the large mintages at this important coin-minting facility. Millions and millions of coins have been struck over the years at the Philadelphia Mint with no mintmarks. One of the most common questions that we are asked is about coins without mintmarks or that seem to be missing a mintmark. Coins - Collecting Guide by Sarah Miller What are Coins with No Mint Marks, and Are They Valuable?
