Honda Super Cub
Honda Super Cub

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Honda Super Cub - Wikipedia

In continuous manufacture since 1958 with production surpassing 60 million in 2008, 87 million in 2014, and 100 million in 2017, the Super Cub is the most produced motor vehicle* in history.
Check out the Motocompo too. A folding microbike meant to be put in the trunk of a kei car.