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Definition of Killer cancel
1. Noun. (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. ¹
¹ Source: wiktionary.com
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1. Noun. (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. ¹
¹ Source: wiktionary.com