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7-21-1967

Möbius strip on Brazilian stamp. Brazil issued a stamp to commemorate the 6th Brazilian Mathematical Congress. It depicts, in bright blue and black, a Moebius strip, the first time that this famous shape had been shown on either stamp or coin. (The stamp has Scott's Catalogue number Brazil 1053.)

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Möbius Strip

Date: 
Friday, July 21, 1967