After using my newspaper.com acct it appears that 79 or so you see the correction key feature and the model often called "Report Electric Correction." By 1983 ish, at least in the dealer ads that show up, they have dropped it and are full steam onto the electronic version of the Report/er.

Anything with "correction" (ie: originally used with white/black super-messy "correction" ribbons, and has the bichrome label "black, silver, white or white/red") will be very late 70's through the 80's. This *could* be 1987, and I think it probably is, because I know that correction started about 1978-9 for Brother, so it probably started around then for other manufacturers too. If someone knew for sure when those awful black/white ribbons were introduced *exactly*. you could pin it down more precisely, but right now, that's as good as we've got.