Very nice! Good score at a good price. I was going to ask the seller if they would sell just the RCM panel and enclosure. After it got bids I changed my mind. The RCM panel looks to be in very nice condition. It is in the rarer indoor enclosure. A Federal Sign & Signal, Chicago 19 Thunderbolt with a Federal Enterprises, Chicago 19 RCM it is probably a very early siren. Probably made just after the grid bar projector horn design went out.
Nice job!