Semi-postal

Postage stamp issued to raise money for a particular purpose

A semi-postal stamp or semipostal stamp is a philatelic term for a postage stamp issued to raising money for some purpose, usually for charity.[1] Semi-postals have an additional monetary value (surcharge), devoted to that specific non-postal, charitable purpose and separated from the official postal value with a "+" sign.[2]

A semi-postal of German Empire issued for WWI victims, 10 + 5 pfennigs, 1919

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