Paging John Dorgan.....vintage light ID requested....
Believe it or not, I have seen a light like that before, but you have to remember I'm an old fart and have been interested in and have worked around emergency lighting for over 30 years.
Back in the mid '70s, there was a Shreveport LA police detective that used that same light in his car. He did an interview in a police magazine called Law and Order in that time period about a bank robber that had managed to rob several banks around the US without being caught until he tried to do it in Shreveport. The SPD had been experimenting with an electronic bug to thwart robberies and the tellers at this particular bank just happened to have one available that day. They put it inside the bag of loot and SPD had a tracking device on the scene within minutes to track it. They tracked him to a hotel room near the bank and caught him literally red handed shortly after the heist, as the dye in the bag had also exploded. An electronic gadget like that bug had not been used for tracking a robbery suspect before, so it made national news and the article was a followup. There was a picture of the detective and his partner inside their car showing off the device and that same type of light was sitting on the dash. I made particular notice of it because at the time, there were only a handful of dash lights being manufactured by the various makers, maybe as few as a half dozen. That one really stood out at the time, mostly because no one else was using one like it. The chrome band on the light is very unique and after seeing the one in then article, I had not ever seen another one like it over the years until I saw this one posted. The chrome band immediately gave it away, as that type of offset around the screw has not been done before in any other light. I may still have the mag and/or the article in my storage, and if so, I'll post it.