[EXNODRAMANOTCH]

I met a guy at a car show last weekend who offered to sell me this pair of Federal Signal Aerodynic lightbars. I thought about getting them for garage art. He said they worked when they were removed and he got them in trade for some other parts from a friend about 15 years ago (he thought they might of been on a military vehicle, but he can't recall any other details). Does anybody know what vintage they are or what they are worth (mounts included)? Thanks for any info you may have,
Bob