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Positional piece - Portion of a sheet of postage stamps, usually containing a variety, extending to the corner of the sheet or other part of the margin containing marks sufficient to identify the exact location of the variety, ...
Positional piece: part of a sheet of stamp, usually containing a variety or other unusual feature, with marks that will identify the exact location of the variety, to confirm that the variety is genuine.
 See also: Packet, Pair, Pane, Paquebot, Packet letter
  
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