Semi-postal design

A semi-postal stamp or semipostal stamp is a postage stamp issued to raise money for some purpose (such as a charitable cause) and thus sold over and above the cost of postage. Typically the stamp shows two denominations separated by a plus sign, but in many cases the only denomination shown is for the postage rate, and the postal customer simply pays the higher price when purchasing the stamps.

The first semi-postal was actually a postal card; to commemorate the Uniform Penny Post in 1890, the United Kingdom issued a card with a face value of one penny, but sold it for sixpence, with the difference given to a fund for postal workers. The first semi-postal stamps were issued by the Australian colonies of New South Wales and Victoria, who both marked the Diamond Jubilee of Queen Victoria in 1897 with stamps denominated in pennies, but sold for shillings, a 12x increase over the face value.

Semi-postals became widespread in European countries at the beginning of the 20th century. In many cases they have become standard annual issues, such as the pro juventute series of Switzerland started in 1913. Many countries issued semi-postal stamps to raise money for the Red Cross in World War I. The surcharges are typically a fraction of the face value; at one points the Fédération Internationale de Philatélie was officially boycotting stamps with surcharges greater than 50 percent of face value, saying that such issues were exploitive of stamp collectors.

By contrast, the United States is a relative newcomer to semi-postals, with its first semi-postal being the breast cancer research stamp issued in July 1998. Several more have been issued since then.