A backstamp, in
philately, is a
postmark on the back of a
cover (almost invariably an envelope), showing a post office or station through which the cover passed in transit. The office of delivery may also backstamp a cover and this type of mark is also known as a receiving mark. Backstamps or receiving marks are sometimes, for convenience or due to local postal regulations, applied to the front of a cover.
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Postmark applied to back of incoming mail to show date and time of receipt at the receiving post office.
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