I had the toy he is talking about, it looks exactly like the rust monster in the sketch. It was blue-grey and was a in box with a bunch of far more dinosaur looking creatures. I remember because I spent ages trying to find what type of dinosaur it was and was annoyed that they put a 'fake' one in my box of dinosaur toys. Mine did not look like the lobster kaigu listed above, it was far more like the sketch. Like a badly moulded "dinosaur with the mace for tail". I wonder if that box of toys is still at my parents place...