Vintage deadstock bikini top! By the brand Dune Deck, which is a 1960’s brand. Based on the tag, likely 1960’s-70’s. Sold by Cherry & Webb which is an old store in Massachusetts. Top says “size 13” and the cup size fits like a large C or small D. It’s also 100% acrylic which shows it’s age! The colors are in bright in person as they are in the photo.