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. 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.
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|Wikimedia Commons has media related to Semi-postal stamps.|
|The Simple English Wiktionary has a definition for: en:semipostal.|
- "GAO Report No. GAO-05-953 'U.S. Postal Service: Factors Affecting Fund-Raising Stamp Sales Suggest Lessons Learned'". Reports & Testimonies (updated daily). U.S. Government Accountability Office (U.S. GAO). 2005-09-30. Retrieved 2009-08-22.