This picture of John Duncan banging one in was taken on 20th March 1971. It was a game against Airdrie - the score - Airdrie 2 v 6 Dundee. A Duncan hat-trick, plus 2 from Alex Bryce and 1 by Jocky Scott.
Below is a sequence of photos capturing one of Duncan's goals. The move starts with a pass by Bryce - JD does the rest!!