This from Martin Nowak:

Just have a question that maybe someone could answer. I recently stopped by the place in Crestwood where former apparatus are sold. I seen what looks like a plaque/sign holder. Anyone know anything about this??? Who it was assigned to? 
 
Front photo is mine. Rear shot is sellers photo. Thank you in advance! 
former Chicago FD ambulance for sale

former Chicago FD ambulance for sale

former Chicago FD ambulance for sale

former Chicago FD ambulance for sale