Another toy mystery: Marx tailless delta shuttle thing

Here's something different, a modified reissue of an accessory called the Moonship, from the Marx playset Operation Moonbase, released in 1962. The original version had 2 rectangular horizontal planes at the rear. The only other change was a nose cone I managed to remove. I took these pics when I got this thing. I don't recall why I put in a helicopter as a reference; that's definitely an Mi-24 Hind. Here's the mind-boggling part, this doesn't look like a big deal for a space plane, but I haven't found any comparable design earlier than the late 1960s. My best guess is that it was influenced by the Vulcan, and maybe the Silbervogel. Any suggestions on where this came from???