: Stamps that are damaged, stuck together, or otherwise "spoiled" through no fault of your own can be exchanged for an equal number of stamps of the same denomination.

: The stamps must have been on sale at local offices within the last 12 months .

: Stamps with a specific cent value (e.g., 25 cents) retain that exact value forever. You can use multiple old stamps on one envelope to meet the current mailing rate. 4. Third-Party Options

You can exchange stamps at a Post Office only under specific conditions:

If you have a large collection of unused stamps and want cash, you may need to look into or private collectors . These businesses often buy stamps at a percentage of their face value (typically 50% to 80%) to resell them.

Do you need help calculating how many you need to use with your specific old denominations?

Are Stamps and Other Postage Products Eligible for a Refund?