precancel
precancel is a postage stamp or philatelic term.
Also recorded as precanceled stamp; precancelled stamp; pre-canceled stamp; pre-cancelled stamp; advance cancellation.
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
stamp used for prearranged mail insertion or training use
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
“Precancel”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2465543: precancel
Consult the source