A Moebius strip is a surface with only one sided. Mathematically it is non-orientable.
Stamp | Description |
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Luxembourg, 3fr.1969 Scott: 480 A131a |
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Belgium, 3fr, 1969 Scott: 723 A242 |
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Germany, 30pf, 1969 Scott: 995 A293 |
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Switzerland, 30, 1974 Scott: |
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Brasil, 1p, 2015 Scott: |