If you have one of these QSLs you have a rare duck.
I only sent out about a hundred of them back when I worked HF, mostly from Michigan where I was first licensed as a Novice (WN8VEF) in 1976.
My ham radio activity today is limited to some local 2 meter and 440 activity and occasional testing of HF wire antennas and other electronic equipment. I don't ever plan to give up ham radio though; I worked way too hard to get my Advanced Class license in 1977.
Future plans will probably include some low power HF work with my Drake TR7, especially on 10 meters.