Center Line Block
The center line block is a block of four from the center of a sheet of early 20th century US stamps, with horizontal and vertical guidelines running through the perfs, or through the center of the blank space between the stamps.
Center Line Block - a block of stamps from the very center of certain sheets, that is, a block on which two guidelines intersect each other.
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Center Line Block - A block of .stamps from the actual center of a sheet of stamps. On early U.S. issues, the center block is considered the most valuable block on a sheet of stamps.
 See also: Stamp, Block, Pane, Margin, Used
  
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