The original Star Wars film was first released on the VHS, Betamax, LaserDisc, and CED formats in 1982, a full five years after its original theatrical release.
Prior to this, the only way that fans could see the film onscreen was through the numerous theatrical re-releases of the period, or through these now-obscure Super 8mm reels released by starwars.wikia.com/wiki/Ken_Films .
Numerous versions were available, some silent (with subtitles) and in black-and-white. All were significantly cut down to a 30-minute runtime to keep the price down. Notably, they omitted the famous opening crawl in favor of a starwars.wikia.com/wiki/Tom_Kane -esque announcer.
There was also a similar release for TESB, but Ken Films went under without producing a Super 8 release of ROTJ.
This is the full version. The first minute or so is missing the audio, which can be found at the second link. I do apologize for the poor quality on the latter link, but this should allow you to get the idea of what the announcer sounded like.
Unfortunately there is a soundless bit at the end too, haven't been able to track down an audio version of that. Oh well.
I claim Fair Use on both of these vids for educational purposes.