Remco got piles of mileage out of these choppers but I rarely see the non licensed stuff in catalogs, mostly you see the Star Trek or the (incredibly stupid) Hulk versions of this. I also never knew what CSF stood for, “Chopper Special Forces” that would have never been my guess.
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I didn't realize Remco had a version, much less licensed versions. The much-beloved version of this toy from my childhood was the Vertibird.