
My guess would be the 50's.Lights like that are neat, to me they help to show the novelty of motor vehicles in the past. These days light "speak" simply with color, illumination style etc but in the past somebody felt a need to explain.
There is an antique truck that makes an appearance at a lot of the local shows that has a STOP brake light in the rear bumper.
Very cool that you were able to get this one in such good shape. Any idea of the age of the light?
I would say even earlier, like late '30s-'40s. Why don't you email them to find out.M.
My guess would be the 50's.