I used the Herb's dark green for 1968. This is not really answering your question about the #1198 1969-1970 dark green. I painted my rear package tray on my 68 Coronet with the 1968 Dark Green paint.
Later on ,looking at the paint chips I should have gone with the 1198 (69-70) because that was the perfect color, exactly the same color of my original package tray from years ago. The color came out very good. The paint laid on really nice.
I painted the package tray 3 1/2 years ago. Still, no fading and it's still nice today. I highly recommend the paint. Many years ago I used SEM vinyl paint, shot with a spray gun to paint a vinyl top. The color came out good. That top was painted in 1994
and it was still nice when I replaced the top 3 years ago. SEM is a very durable paint.