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16. Inverted overprints and precancels of Bureau of Engraving and Printing: Two types are known. The first is the four inverted 1969 Christmas experimental precancels. The Post Office Department supplied electrotype plates for local use, and the test was tightly controlled from Washington. Yet a few panes were precanceled upside down. They are not cataloged and do not have great value. The second type is the Bureau precancels for Des Moines, Iowa; Detroit, Mich.; and Dallas, Texas, which can be found reading both up and down on the 20¢ stamp of the 1922 definitive series. None of these is rare.
Type 16: Inverted "IR" overprint of 1898 (Scott R155c).
Type 16: Precancels on these copies of Scott 567 are sideways.
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