Haebbie, as it turns out, we had a major kerfuffle about that a while back here on the forum, and..........
The traditional story has now changed. Bos himself is now saying he heat treated most of the Buck blades for many years before 1980.....So.......as with all things Buck.....stories change.
It seems possible that 1980 was the first year he did them in-house, but even that seems to be based strictly on memory rather than physical documents.
We know the three dotter is a great knife......at least we still have that popular opinion.