Cylinder Blocks
Printed marks appear on the stamp margin (selvedge). Blocks of stamps with the marks printed on the selvedge are popular with collectors.
Datestamps ...
Plate block - Block of four, six or other number of postage stamps complete with portion of sheet margin containing the printed number of the plate used; this is the recess-print couterpart of the cylinder block of gravure printing.
 See also: Packet, Pair, Pane, Adhesive, Cylinder
  
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