Toyo Kogyo Co. Ltd
Mazda as it is now known, developed a 250cc 2-stroke in 1929 called the Toyokogyo with the intent of entering domestic production. A total of 30 were sold, and then their attention shifted to the manufacture of a three wheeled utility truck.
There is a nice write-up on the Mazda corporate web site at this link, and below is a screen shot just in case they revamp the site at some point.
Tank emblem and left side view of machine.