- Postage stamp block
philately, a block is a group of postage stamps still attached to each other. 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.
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
perforationor 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 Statesstamps the zip block includes a promotional mention of the ZIP code.
The most commonly-collected kind of block is the
plate block, which includes the part of the margin where the serial numbers of the printing plates may be found.
Although blocks of rare stamps are highly valued, a block's price may actually be so high that no buyers can be found, leaving the owner with the agonizing prospect of breaking up the block, so as to be able to sell the stamps individually. In some cases, dealers have publicized plans to break up a famous block, in the hopes of that someone will come forward to save the block from destruction.
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