Is this a Billy Boy three-wheeler?

[M.P.Trike]

I recently found this scooter in Oakland, California and restored it. I replaced the fork bearing and one of the rear wheels (with an identical copy) but otherwise used the parts on the trike as found. On the original and on the restoration, the fork bearing is bolted underneath the riding board, unlike the more common over-board placement. I am guessing 1930’s. this a Billy Boy or some other make?

 

[1motime]

This was a common design for many companies. A plank of wood with running gear. Looks to be in great condition!