I've finished the two kits pictured above.
I had one of these kits when I was a very young child. Probably about 7 years old or so. .I can't remember much about the model itself other than the fact that it was motorized. ( comes with a wind-up key and a spring motor)I think the one I had was either the dimetrodon or the iguanodon. I can't remember how well the motorized movement worked either. Probably not very well, since it didn't leave any lasting memmories. I guess I'll find out when I start building these. I will start on the brontosaurus first, since the box is already opened. The triceratops is still sealed, so if the bronto really sucks, then I'll sell the the trike.
Hopefully, they won't be that bad. The parts are pretty plain, without much detail. As long as the parts fit isn't horrid and they at least sort of move around, then I might pick up the rest of the series just for novelties sake.
Not sure when these were made. There is no date on the boxes or the instruction sheet. From the 350 after the part numbers on the boxes, I assume the original price was $3.50.