I had an old tin toy car from the 60s that looked almost exactly like that, usually the japanese toy companies back then modeled their futuristic car toys from orig US concept cars maybee it's from a concept car?
Well I can tell you it came from an old farmhouse my parents bought. I don't know if whatever this came off from was actually all there as I found it in a pile of scrape metal while we were cleaning up the yard. The former owner was sort of the local salvage yard. It's at least from the early 60s.