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Research Paper #21 - Printing History of the 6¢ 1938 Airmail Stamp, Scott C23

This paper presents data in three parts. The first is a description of the marginal markings that occur on these stamps. The second is a list of the dates the plates were assigned and certified, the printing periods, impression totals for each period and press used, and the dates the plates were modified and finally cancelled. Total impressions for each plate are tabulated. The third section shows the sets of four plates at press together for the various printing periods, the press used and the impressions for that printing period. 19 pages.