30 all different used airmail & other back of book US postage stamps with C1

This collection features all different unique airmail and other US postage & other back of book stamps originating from the United States. The stamps have been previously owned and are ungraded. Each stamp comes with its own unique story and history, making them perfect for collectors or those interested in American postal history. The stamps are uncertified, adding to their authenticity and appeal. Add this unique collection to your own stamp collection or give as a gift to a fellow stamp enthusiast. I used AI to describe, so sorry for the BS. a6