Can you help me identify this headlight assembly?

I have this vintage headlight ***embly, probably from the 1930's, and it looks like it might have been on a truck, due to its heavy/sturdy mounting bracket. The housing measures 10 inches across the front, and 6 inches deep.Any ideas what it might have come from? TIA.

Al

 

Big truck manufacturers usually outsourced parts like headlight ***emblies, so the same headlights by suppliers such as Guide (a subsidiary of General Motors) and BLC could be found on many different makes of big trucks, buses, fire engines, etc.