Shot in Superpanorama 70, it looks amazing, I think. Incidentally, after Old Shatterhand, made two years earlier, in 1964, Pampa salvaje was Argentinian-born director Hugo Fregonese’s second 70 mm film. Working in Hollywood, Argentina and Europe, Fregonese had a colorful career, directing almost thirty films of a broad variety. An interesting article on his life and work can be read on Film International’s website.