It's a neat little bike but I don't think it is actually one of the "Flying Flea's" from 1941.
The actual "flea" muffler looked like a quart size can of Red Bull laying on its side and located across the frame in front of the engine. There was no speedometer and there was no rear license plate.
It does look like the 1946 model RE though with its 3 speed hand control shifter. The model RE was made thru 1953.