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postage stamp block
In philately, a block is a group of four or more unseparated stamps.〔(Stamp Collecting Definitions & Philatelic Terms. ) Stanley Gibbons, 2013. Retrieved 30 June 2013.〕 Blocks are of interest not only because they are rarer than individual stamps, but they also preserve relative positions of stamps as they were originally printed, information that is crucial to understanding how the stamps were produced.
==Format==
Blocks of stamps from the edges of the original sheet or pane often include sections of the sheet's margin, which may have a wide variety of information. For instance, arrow blocks preserve the guide lines used by line up the sheets for perforation or other production steps (these are usually angled in an arrow shape, thus the name), and center line blocks includes lines printed down the middle of a sheet. An imprint block includes the name of the printer, while for many United States stamps the zip block includes a promotional mention of the ZIP code.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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