This from Drew Smith addressing the post on Chicago FD helmets:

Attached is a photo of a brass one I added to my New Yorker helmet back in the early 1980s as well as an aluminum one. They were available in brass or aluminum. I thought the brass looked better than the aluminum worn by many others but soon realized the weight of this small ornament was tremendous.

firemen from the 1980s

Drew Smith collection

New Yorker fire helmet

Drew Smith photo