Check out Empire. From just skimming through it I noticed a few occurrences where the very bottom of the frame has a thick red line when changing from one shot to another.
1) The awesome shot in the cockpit of the Falcon from behind looking out the window approaching Cloud City. When it changes to the shot of the crew facing left, the last frame before the shot change you’ll see it.
2) Also, the establishing shot of Leia in the penthouse in CC, when the shot changes from the exterior to the interior.

I’m at work right now but I’ll put up a capture when I get home if no else does by then.