These are not regular Forever Stamps. They are additional ounce stamps that are added to a Forever stamps for larger/heavier pieces of mail. To mail a
Stamps and Surcharges for Non-machineable Mail
USPS New Stamp Issues on
If I don't have the butterfly stamp can I use 2 forever stamps to pay for non-machinable envelope? - Quora
First-Class Mail & Postage
These are not regular Forever Stamps. They are additional ounce stamps that are added to a Forever stamps for larger/heavier pieces of mail. To mail a
School Bus Additional Ounce Postage Stamps (for use with 1st Class Postage Stamps for Larger/Heavier Letters or use 3 of These Stamps for mailing 1
School bus featured on new United States additional-ounce stamp
Single (24-cent) School Bus-Additional Ounce Rate coil stamp in MNH, VF condition. The stamp is in post office fresh condition, so no flaws noted. The
United States #5741 (24c) School Bus-Additional Ounce Rate coil MNH (2023) | United States, General Issue Stamp
School Bus Stamps
Why do people put 3 stamps on letters? - Quora
School Bus Additional Ounce Postage Stamps 1 Sheet of 20 Students Children Teachers Celebration Party Announcement (20 Stamps), Yellow : Office Products
Stamps and Surcharges for Non-machineable Mail
US Postage Stamps for sale
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School Bus Additional Ounce Postage Stamps (for Use