In philately a reprint is a new printing of a postage stamp from the original plates. A reprint is to be distinguished from a new print which is not printed from the original medium. A reprint may or may not be valid as postage.
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Background
While it is common for a postal service to add print runs as stocks are used up by the public, it is also the usual practice to only use a given design for a limited period of time so as to discourage forgery, and then to destroy the printing plates.
Sometimes the authorities keep the plates on hand, and reuse them later. The reasons have included:
Identifying reprints
As reprints are produced from the original plates, it can be very difficult to distinguish them from the original printing. Frequently subtle details matter, such the type of paper, type of gum, or color shades. Reprints often appear fresh and bright compared to the originals.
Official reprints
In a few cases, the postal authorities have produced official reproductions, copies of an existing design created on new plates. A notable example of this occurred in 1875 in the United States, where all stamps issued to date were reproduced or reprinted with the intention of making them more readily available to collectors. (Ironically, the actual numbers printed were small, and so most of the reissues are now rarer and more expensive than the originals they resemble.) In 1962, to prevent people profiting from the issue of an invert stamp error, the United States Post Office Department intentionally reprinted 40,270,000 copies the yellow Dag Hammarskjöld invert stamp.
Unofficial reprints
Unofficial or illegitimate reprints also exist, being produced by private printers who were contracted to print stamps, but retained the plates for their own use. The classic example is the Seebeck reprints of Latin American stamps produced in great numbers around the end of the 19th century.