From the summer of 1985 (right around when Seaver won his 300th game ).
The first is from Inside Sports (anyone remember it?). A seven-page article (people actually read long articles back then) discusses the long careers of Seaver, Koosman, and Ryan. It still hurts when I read “Seaver is the heart of the White Sox.”
The second cover is – this is a surprise – People! Published the week after his 300th, this is a 2-page article (starting on page 41 of course). Shannon should particularly like this issue as it also features The Boss.