Existing comment:
Non-denominated stamps are also known as No Value Indicated (NVI) stamps. They can mystify mailers or postal clerks who need to know their value. In fact, the Universal Postal Union used to require that all stamps show their denomination in Arabic numerals. So, NVI issues initially could not be used on mail to foreign destinations. The UPU later revised this policy, and NVI stamps are now valid for postage to all destinations.
Throughout the 1950s, Canada overprinted the letter "G" on existing stamps to indicate their intended use by government agencies. Previously, Canada had followed the convention used by most British Commonwealth countries and overprinted the initials OHMS (On His/Her Majesty's Service) for this purpose.
The first US "Forever" stamp sold for 41 cents when issued in 2007. It will pay the first-class domestic postage rate forever. Since the end of the alphabetic series in 1998, other US rate-change stamps have included flags, flowers, and toys. |