We have a journalist who is looking for information on a 1906 Edwin. Below is his email to me.

By accident we saw there had been Edwin motorcycles built in the USA in 1906.
It had a very special engine, a single cylinder with two crank shafts who were turning in opposite direction to eliminate vibrations. As far as our information goes, there only a few built, it wasn't a success.

We can't find further information or pictures.
Maybe you can help us? We are very curious about the technique,

Greetings from Holland,

Hank Kooijman men.h.kooijman@quicknet.nl
Classic magazine

If you have any information, please feel free to send him an email direct. Thanks - Keith