Skip Goulet said:I wonder why the 185 wasn't marketed. I had to look twice to notice the 5th bulb. Remarkable!
The lamp holders in that prototype are the skeletonized design, introduced by Fed Sig in 1978, so this must have been made in the late 70's or early 80's. Sealed beam beacons and lightbars were losing ground to those that used reflectors and halogen bulbs by the late 1970's. I expect Fed Sig could see the writing on the wall and halted the development of sealed beam beacons and lightbars.