Large green hollow hard plastic figure of the prehistoric sail-back reptile Dimetrodon is approximately 13 & 1/2" long (to the part where the tail curves around) X 6" wide X 8 & 1/2" high. His head, which is detachable, is hinged at the back so that it gently bobs up and down or from side to side. There is a gear of some kind on the left side of its body; it turns in one direction and it only function would seem to be as a noise maker. Below the gear you can read, 'Copyright Mego Corp 1976, Made in Hong Kong'. There are what look like ball bearings under each foot, but they don't move. On the right side of the body there are two areas that were covered over with green paper.  Is this a Prototype? No idea. I worked in toys for decades and never saw this anywhere. 

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