1917-19 Flat Plate Printing - no watermark #498-518

The Experiment Continues
While Perf. 12 made stamp sheets and coil rolls too brittle, the adoption of Perf. 10 caused the opposite problem -- Perf. 10 stamps were difficult to separate, often resulting in torn, ragged perforations. The Post Office decided to try Perf. 11 as a compromise.

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22 Items

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  1. # 517 - 50¢ Franklin - red violet
    mint
    $72.00
    used
    $0.95
  2. # 518 - $1 Franklin - violet brown
    mint
    $85.00
    used
    $2.50