These are not my lights...I saw them on Craigslist (Jersey Shore).
jerseyshore.craigslist.org
McDermott Circle Beam Emergency Lights - collectibles - by owner - sale - craigslist
This is the 4 beam rotating model. I think these are late 40's to early 50's. There is a thread about them that includes a video if you do a google search. $225 for the two lights with flashers....