Advertisement pane

Advertisement Pane A booklet or sheet of stamps with one or more stamp spaces used for commercial advertisement.
Advertising Stamps It was first used during World War I as a propaganda tool.

Advertisement pane - A pane of postage stamps from a booklet in which one or more of the stamp-sized areas bears an advertisement or slogan.
Aerogram - See Aerogramme.

See also: Packet, Sheet, Stamp, Used, Watermark