These 1975 Christmas stamps don't indicate the price per stamp, as the USPS was preparing for a rate hike when they were issued, but didn't know the details. Would the USPS treat

FanFlex: Lightweight flexible crests and patches that fold easy. - FanTex: An all-new super comfortable soft fabric. - FanFit: The authentic on-ice

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United States Postal Service - Wikipedia

These 1975 Christmas stamps don't indicate the price per stamp, as

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Assignment 12

United States Postal Service - Wikipedia