It's not often that a vintage plastic X-plane toy pops up on the web but this X-15 pictured above turned up on fleabay last week. Nine inches long and made by Cowley, a manufacturer not known to me. As it's an official X-plane toy it's by default related to the SWORD Dyna Soar aka the X-20. The swing-wings also remind me of that other plastic 'X-plane', the diminutive SWORD Scout 2 seen below.
The caption to the photograph is hard to read so I've typed it out below. Any further information about this mysterious rocket aircraft would be much appreciated!