RE: Need to identify Ohlsson Rice Motor.
This is a good example of the engines available for model planes back in the late 30's and 40's. They ran on gasoline and a very heavy weight oil (60 if I remember correctly), used a coil and spark ignition with a true spark plug. About all that was available prior to the invention of the glow plug. They were low revving engines with large (compared to the modern engines) diameter props. I'm surprised some engine collectors are not knocking down your door to get this.