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In philately a killer is a particularly heavy type of handstamp consisting of heavy bars, cork impressions or other crude devices used to cancel postage stamps.〔Bennett, Russell and Watson, James; ''Philatelic Terms Illustrated'', Stanley Gibbons Publications, London (1978).〕 Such handstamps may also be known as ''obliterators'' as the mark applied often obscures almost the whole of the stamp. Killers were often used in the early days of stamps as the postal authorities wished to ensure that stamps could not be re-used. In the United States this is also the name for a particular circular date stamp with four thick horizontal bars to the right. This handstamp effectively cancels the stamp while leaving the place and date information easily visible. The bars are known as ''killer bars''.〔Patrick, Douglas & Mary. ''The Hodder Stamp Dictionary'', Hodder & Stoughton, London, 1973, p.126. ISBN 0-340-17183-9.〕 There is no exact definition of what is, and is not, a killer cancel and the term is often used to apply to any heavy cancellation. == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Killer (philately)」の詳細全文を読む スポンサード リンク
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