There is a US NTSC letterbox set from 1992 but far less common. Its not rare either. But back then everyone wanted full screen tapes.

I have this set of the letterbox tapes and they come from the same video master as the Japanese Special Collection, the same as the US first issue widescreen laserdisc releases. With the same misframed image to fit the Japanese subtitles which aren’t on the video but they never corrected them.

Jedi is the worst effected. And it wasn’t corrected until the remastered THX releases which began with the definitive laserdisc collection and faces laserdisc, and also the widescreen tapes.