killer cancel
Noun
Meaning
killer cancel (plural killer cancels)
(philately) A cancellation mark that is so heavy that it defaces the postage stamp to which it is applied, devaluing it from a collector's point of view.
Noun
killer cancel (plural killer cancels)
(philately) A cancellation mark that is so heavy that it defaces the postage stamp to which it is applied, devaluing it from a collector's point of view.