Test stamp
A test stamp is a label resembling a postage stamp that is used by postal authorities for testing equipment. They generally have the same size and shape as regular stamps, but with a minimal design.
A test stamp is a label resembling a postage stamp that is used by postal authorities for testing equipment. They generally have the same size and shape as regular stamps, but with a minimal design.
A test stamp is a label resembling a postage stamp that is used by postal authorities for testing equipment. They generally have the same size and shape as regular stamps, but with a minimal design.
Source: Wikipedia "Test stamp" · CC BY-SA 4.0
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