There's another explanation for why it would be cropped on the top and bottom, other than being 16mm-sourced. On film, before the 2x anamorphic stretch, Panavision actually has an aspect ratio of about 1.20:1, not 1.33:1. If it's from a 35mm print, then since it was transferred straight from the print without any anamorphic adjustment, it would have been vertically cropped by about 10% in order to fill the screen.

The adjusted pic bears this out, it has an AR of about 2.63:1.

If only the bootlegger had had the foresight to do a pillarboxed transfer...oh well. I'm just amazed we have a bootleg of this high a generation.