Here’s the problem.
Documentation is helpful, but not always accurate.
There is documentation for 1.85. AMPAS chooses to run the film at 1.37, as do some other venues.
Look at the film, and the headroom appears to open, but may not crop equally with the bottom of the frame.
I plan to try...
Paper isn't needed here. Simply facts.
1. Projectionists didn't ride the framing knob. They would set it, generally for the main titles, and leave it. If original leader was attached, that would occasionally have framing legends.
But take a look at these examples, based upon the main title...