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Saturday, June 20, 2026

Marx #4672 'The Flintstones' Playset (1961) - Pt 19 Dinosaurs: Marx Mold Group PL-755 (Small Mold Group) x2

Marx included two sets of Mold Group PL-755 (aka the Small Mold Group) for a total of 14 figures. While all of them fall under the generic heading of 'dinosaur', in point of fact, two of them were not. The Dimetrodon and Sphenacodon are classified as Synapsids, a species of critter more closely related to mammals than they are dinosaurs. Living during the Paleozoic and Mesozoic, they cam w-a-y before the dinosaurs, which didn't appear until the Triassic period.

Ed

Here are the five different types of critters:

Dimetrodon (Synapsid)


Sphenacodon  (Synapsid)



Cynognathus (Dinosaur)



Plateosaurus (Dinosaur)



Triceratops (Dinosaur)


Flintstones Playset

As stated before, the Marx #4672 playset included two groups of 'dino's' for a total of fourteen pieces. The two groups would have come in either grass green, light mint-green, or light gray and were color matched, flat finish, soft plastic. I'm not aware of groups coming in two different colors in the playset. Each of these animals were covered in separate posts back in the November 2020 time frame and by using the 'search' function on the blog you can see more in-depth write-ups.

Unless you get a complete original Flintstones playset, or are able to acquire two complete sets of color-matched figures from somewhere, it may a bit tricky to come up with fourteen color-matched figures. While my playset was mostly complete, a couple of the dino's were missing and I had to flesh out the group with individual pieces.


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