Years ago, before Forever stamps and ClickNShip prepaid mailing labels, I bought a bunch of stamps for potential Express Mail. I also bought a batch of 1c, 5c, and 10c stamps. Those were to let me use the 33c stamps and such when the letter rate changed to 34c. Forever stamps made that irrelevant.
I finally unloaded the above stamps by paying for a Priority Mail package. I love the ‘upside down airplane’ stamp, a reprint based on the celebrated 24c Inverted Jenny airmail stamp (a.k.a. C3a among hardcore US philatelists). The blue profile of Ben Franklin dates from the late 1800s in style, but was recently reprinted by the USPS.