I too, would like to see pictures of an '81 and a '83 side by side.
I was given a later than '79-'80 stand by Randall, but it just came to him in a box along with his bike, so I doubt he knows what year it is from.
All I know for sure is it has the large ribbed flat plate on the left foot for deployment, the tang for putting the stand to the ground is formed sheet metal rather than the solid round steel that I am used to on my early stand. The right side foot on my new stand is your standard open round hole, waiting for a rubber plug.