Vintage Plastic Glen Dimension Co. King Convertible Mint in Box 1950's Toy Car

Here you have a very rare piece. First one I have ever seen in 40 years of toy collecting! This 11" long piece is mint in the box. No play wear. Has clear plastic windshield. Not sure what car mae is. It looks to be a 1950's car of the future. Box does show some shelf wear. US shipping will be $12.00.