MYSTERY FAYGO FLAVOR

I OWN A PROPERTY PRESERVATION COMPANY IN MICHIGAN. WHEN I WAS CLEANING OUT A HOUSE I FOUND THIS FAYGO BOTTLE IN THE BSMNT. I HAVE ASKED MY IN-LAWS AND MY PARENTS WHO ARE ALL IN THEIR 60'S AND 70'S IF THEY HAD EVER HEARD OR SEEN OF THIS FLAVOR AND THEY HAVE ALL SAID NO. I EMAILED FAYGO FOR SOME INFO ON THIS PRODUCT AND ALL THEY TOLD ME THAT IT IS FROM THE 50'S AND THEY WOULD OFFER ME A FEW DOLLARS FOR IT. THE ONLY OTHER INFO I FOUND WAS ON PATTY WRITES AND IT SAID THIS CAME OUT IN THE 60'S AND WAS A FLOP. DOES ANYONE ELSE KNOW ANYTHING ABOUT THIS AND MAYBE HAVE A CLUE AS TO WHERE TO FIND OUT ITS WORTH AND HOW COLLECTIBLE IT MIGHT BE? THERE IS A 53 STAMPED ON THE BOTTOM OF THE BOTTLE. I DONT KNOW IF THAT IS THE YEAR IT WAS PRODUCED OR NOT. MYSELF, MY FAMILY, AND FRIENDS WOULD LOVE TO GET THIS MYSTERY SOLVED.