Postmark - Wikipedia
https://en.m.wikipedia.org/wiki/Postmark
A postmark is a postal marking made on an envelope, parcel, postcard or the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indicating where and when received or in transit. Modern postmarks are often applied simultaneously with the cancellation or killerthat marks postage stamps as having been used. Sometimes a postmark alone is used to cancel stamps, and the two t…
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