semi-postal

semi-postal is a commemorative stamp or philatelic term.

Also recorded as semi-postal stamp; surtax stamp.

Overview

Catalogue entries for stamps state issue, perforation, gum and certification. VALÉORINE records this subject so that lots referring to it can be described consistently.

In detail

postage stamp issued to raise money for a particular purpose

Sources

Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.

reference work · Reputable secondary · Wikipedia
“Semi-postal stamp”, English Wikipedia, consulted as further reading
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reference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q230761: semi-postal
Consult the source