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20. Mistakes in the overprint: There are any number of flaws, but important and constant errors are less often seen. One is the inversion of "OHIO" in some Liberty-issue Cincinnati precancels so that it reads "OIHO." Another is "Mikwaukee" instead of "Milwaukee." In other cases, periods have been omitted in abbreviations of state names. These have modest value.
Type 20: The precancels on the bottom pair of these 3¢ Liberty stamps (Scott 1035) read "OIHO" instead of "OHIO", due to the OHIO slug being inverted when making up the precanceling mat.
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