Advertising cover in philately refers to a postally used envelope with advertisement for the products or services offered by a business or organization. In addition to the name and return address, the advertiser's text or illustration may appear on either the front or the back of the envelope.
Advertising cover in philately refers to a postally used envelope with advertisement for the products or services offered by a business or organization. In addition to the name and return address, the advertiser's text or illustration may appear on either the front or the back of the envelope.
Source: Wikipedia "Advertising cover" · CC BY-SA 4.0
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