war tax stamp
war tax stamp is a revenue stamp or obligatory stamp.
Also recorded as wartax 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
revenue stamp required in addition to regular postage during a war
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
“War tax stamp”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2390844: war tax stamp
Consult the source