Ali Farka Toure's Mystery Electric Guitar: The Seiwa Powersonic

The guitar seen accompanying Ali Farka Toure in numerous photos is a Seiwa Powersonic:

Evidently, Toure replaced the neck or the logo simply vanished from this guitar:

The Powersonic was a guitar manufactured in Japan by Ibanez under the Seiwa brand.

Thanks to Chris and Dmitry for helping me to track this information down.