Puggo - Jar Jar's Yoda said:

The audio on rsortor's print is NOT the 16mm mix. What is the easiest way for me to determine whether it is a foldown of the 35mm or the 70mm?

The 70mm ESB was a different cut of the film, so it's probably the 35mm stereo if it differs from the 16mm mix.

The differences heard in the 70mm: http://originaltrilogy.com/forum/topic.cfm/70mm-6-Track-Dolby-Stereo-mix-differences/post/571575/#TopicPost571575

In June '80, the refined 35mm version with its new audio mix were released.

There's no info out there what the 70mm prints looked like or sounded like when shown in foreign markets or re-releases, if they were the same early cut of the film that was shown in US, this is still a little mystery to me. Could the "16mm mono mix" on PSB be a fold-down of a refined 70mm mix? I don't know, no such info seems to exist.