Postage stamp

A postage stamp is evidence of pre-paying a fee for postal services. Usually a small paper rectangle which is attached to an envelope, signifying that the person sending the letter or package has paid for delivery, it is the most popular alternative to using a prepaid-postage envelope.

Test stamps

"Test stamps" are not actually postage stamps but for testing printing processes, equipment, and the like.

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In the United Kingdom test stamps for coil dispensing machines are sometimes known as poached eggs, because of their design. They are printed the same size and format as the definitives and perforated in the same manner. The amount of ink used is also the same as actual postage stamps, so that they can be used to test the machines with material as close as possible to the actual postage stamps. The colour of these test stamps was changed from green to black after 1937 when some test coils were accidentally left in a machine and used as half-penny stamps. At the time of this colour change, text was also added to the centre of the labels indicating their use.

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