Where did the One of our Dinosaurs is Missing dinosaur come from?

It’s now fairly well established that the remains of the Krayt Dragon that C-3PO and R2-D2 walk past in an early Tatooine scene of Star Wars (1977) were re-used from the knockabout Disney film One of Our Dinosaurs is Missing (1975). I want to quote the Telegraph article I just linked, because it’s pretty amazing: “The British view [on making the film] was definitely more tongue in cheek.” That would be true from the very start of principal photography on A New Hope on March 22, 1976. Arriving in Tozeur, Tunisia, producer Gary Kurtz opened the Lockheed Hercules aircraft that he’d chartered to ferry equipment over from London, and was surprised to find… a dinosaur skeleton. And not just any dinosaur, but the diplodocus from Disney’s One of Our Dinosaurs Is Missing. His new British crew had found the prop at Elstree, where it had been filmed a couple of years earlier, and had gleefully hidden it on the plane for a laugh. But no matter: it then became the skeleton we see when C3PO and…