This is a extremely rare KZEW sticker, accordingly to original KZEW program director Ira Lipson. During this era, the ZOO stickers had a clear background, and KZEW released this one with a white background to cover up their competitors stickers. "We noticed that a lot of people were still driving around with other stations bumper stickers so we decided to issue a limited edition of ZOO FREAK BUMPER STICKERS so listeners could cover up competitors stickers with one of ours", says Lipson. Released in early 1974.