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|Create Date||June 29, 2015|
This Research Paper lists the printing periods for each plate, and also lists the sets of plates that were at press together for each printing period. The data come from the plate vault records of the Bureau of Engraving and Printing. The coverage includes all 1¢ and 2¢ flat plates used for sheet stamps, as well as rotary press plates used for coils of all denominations and for 1¢ sheet stamps. Offset plates are not included, since these plates went to press only once and the dates are listed in the B.I.A. Plate Number Checklist for plates 1-20,000. Booklet panes plates are not included, since they are in Research Paper #8. The coverage is from 1908 to 1923. 148 pages.