It appeared on the 1984 LP 'Waltz Of The Wind' by 'Fiddle Fever', which included Jay Ungar and Molly Mason:
https://www.discogs.com/release/6522303-Fiddle-Fever-Waltz-Of-The-Wind
So 1983 is a very plausible copyright date - i.e. the date when Ungar or his agent made the copyright deposit.

The first printed sheet music may have followed years later, when The Civil War popularised it. Perhaps he xeroxed a few dozen copies for his students in the '80s. Perhaps they played by ear.