So when I was sorting through the odds 'n' ends I acquired in the Bucket o' Godzillas I purchased from the antique store, I really thought I had the severed head of Mechani-Kong.
Mechani-Kong is of course the giant robotic gorilla from the movie King Kong Escapes:
And this is the toy component in question:
However, no amount of Googling would turn up a toy Mechani-Kong with a head that looked like this. Here are a couple of examples:
Finally I stumbled upon this discussion thread, which included a picture of a customized action figure that someone had created by mounting this head onto the body of Iron Monger, the villain from the first Iron Man movie:
Thankfully, the discussion itself also solved the mystery. This was NOT the severed head of Mechani-Kong, but rather the Muppet Labs Gorilla Detector:
Not sure how I missed that episode of The Muppet Show, but here is the relevant clip:
So now my desk is as safe from gorillas as Dr. Bunsen Honeydew's Muppet technology can make it...
Update: Muppet Labs' Mechani-Kong Revisited