JD appears to have been a DIY label. I assume it gained its name from the initials of Scottish singer Johnny Duffy, who put out an EP called 'Johnny Duffy Sings', featuring 'Love Is All' and three other tracks, in 1973. The catalogue number of the EP was JD-101, and the tracks were recorded in Craighall Studios, Edinburgh. As can be seen from the scan, which Nicholas Hough has kindly provided, JD bears a family resemblance to the other Craighall labels such as Road and Mayfair (q.v. both, also the 'TD / Craighall Studios' page). Duffy went on to make an album for Nevis Records, 'Live From London' (NEV LP-110).
Copyright 2013 Robert Lyons.