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Bob-A said:
Fog lights are an item from the later '30s. Earlier bumper bracket mounted lights were called road or highway lights. Yellow lens fog lights first came out in 1936. The Unity lights being sold these days are continuations of models that came out after WWII. The first seal beam fog lights came out
in 1940 and were called "glasseal" types. The S-4 model Unity was of this type and when the bulbs were clear they were called driving - passing lights. Raised lettering on the bottom of the bulbs stated "Driving" or "Passing". The S-4 Unity light shell is also a fatter or more teardrop style.
As fog/driving lights advanced in design through the years they became slimmer or a flatter style. For years I have been studying and collecting
road/fog/driving/passing/highway lights and lamps.;)

Bob-A:D
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Bob-A sounds like you know your stuff on theses lamps! I just picked up a set that are 6 Volt glass sealed and have a red topper on the lamp ret. ring. I think I saw an Oregon company name on the or maybe San Fran. Any knowledge of these? I can't post a pic yet but could do later.....
 
Farrell In Vancouver,

They sound like they were made by the "S & M" Lamp company. S & M was located in Los Angeles, CA. If they are sealbeam and all chrome (sometimes the lights would have a chrome body with a stainless steel lens retainer or rim) with the red toppers. Are the red toppers made out of a hard plastic material? If so, you may see an S/M indented in them. I would guess-to-mate their age range in the later '40s to early '50s.

To help complicate things another light/lamp company called "Do-Ray" of Chicago, IL., also might have used the red topper (or top-knot as I
like to call them) on some of their lights. Generally the model numbers or names of the lights were on the top of the light shell or body near where the rims attached to the shell. The makers also stamped their names and location in this area too. The Unity company at times would be different :p and locate their info either at the top of the shell or around their version of a top-knot or even around the bottom of the shell where the bumper bracket saddle/stud was riveted to the light shell.

I hope I was of some help to you. In the years I have been studying
"fog lights" I have found practically zero information on them. What I have learned is through reading/collecting sales catalogs, pamphlets or
original magazine ads from the 20s and 30s. ;)

Bob-A:D
 
Bob-A was right they are S&Ms and in prety good shape just missing one of the plastic "Toppers" so if any body finds one let me know.
Buz, thanks for that link, I see they still make "Vintage" lamps for us although I didn't pay $200.00 + for mine.
 
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