The most expensive postage stamp in the world is actually an illegal one. Although the Penny Black went on sale on May 1, 1840, it wasn’t until five days later—on May 6—that it was permitted to be affixed to a letter as postage.
The most expensive postage stamp in the world is actually an illegal one. Although the Penny Black went on sale on May 1, 1840, it wasn’t until five days later—on May 6—that it was permitted to be affixed to a letter as postage.
