Also, https://www.digibarn.com/collections/screenshots/xerox-star-... shows the date as "Tuesday May 15", which occurred in 1984 but not 1981.
Further down it has a window with "9-Feb-84", consistent with this being from 1984.
And https://www.digibarn.com/collections/screenshots/xerox-star-... has date from 1983.
