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Two recent finds, both scarce, document invalid use of US airmail stamps
Linn’s Stamp News This August 1968 envelope was underfranked for the existing domestic airmail rate (10¢ for a letter up to 1 ounce), but neither could the 8¢ airmail stamp be used to pay the regular first-class letter rate of 6¢. As the handstamp states, “AIRMAIL … |
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