Not in nature, but Möbius conveyor belts were patented. Here is a 1949 patent to Owen Harris,
for an abrasive belt,
as described by Clifford Pickover:
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[![ConveyorBelt][1]][1]
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<sup>
Image from Pickover, p.44.
</sup>
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> Pickover, Clifford A. *The Möbius Strip: Dr. August Mobius’s marvelous band in mathematics, games, literature, art, technology, and cosmology*. Thunder’s Mouth Press, New York (2006).


  [1]: https://i.sstatic.net/eAPov.jpg