Training stamp
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A training stamp is a postage stamp or stamp-like label used in training postal workers how to cancel postage stamps.
Postage stamps used for training purposes are marked or overprinted in some way to invalidate the stamp for postage purposes. Labels issued specially for training have the size and shape of real stamps, but the design is usually a block of solid color or an unadorned number.
Training stamps are actively collected by stamp collectors specializing in the country of issue or in cinderella stamps.
France and the United Kingdom are among the countries that have issued training stamps.