After doing much more research on this item, I have learned that this is in fact a pre-1947 helmet, so older than I thought and a hard to find 7 1/2 size.

Super rare find! A vintage Pittsburgh Bureau of Fire Leather Cairns Fire Helmet. This appears to be from Squad 6, which was eliminated in the 1970's. Prior to 1985-1986, firefighters had to purchase their own fire gear.

This appears to have possibly been re-painted at some point but in good condition for it's age. It's a size 7 1/2 and is a pre-1947 model.

This is super rare as it's almost impossible to find a Pittsburgh Bureau of Fire helmet, especially a leather one this old!