Vintage spot lite. Mfg. Portland Oregon. Pat. Pending. Motorcar or motorcycle?
Can you post photo of back side. Unusual light. Any name?
I've sold many lights , never saw that one.
Don't rule out being from a boat. Richard
Side Ray Spot Light Co. Pat. Pend. Made in USA Portland Oregon.. Stamped in brass button..
I think Richard is on the right track. Everything I search comes up nautical. Looks circa 19330-35
Neat piece