Brooklyn Chewing Gum were an Italian cycling team during the 1970s and early 80s. It was a classics team and featured many of the great classic riders such as Roger de Vlaeminck, who won four Paris–Roubaix.
This is a trade jersey sold around that time in bike shops (rare even then). I used to wear it out on my bike… it's wool. That's how old I am. It will never be for sale. (Unless someone offer a great sum)