I looked quick in an old book I got from a now deceased friend. This book was in his shop for over 40 years, so a few pages are missing.
This is directly from his paint book, showing colors in 1965. Could not find 1968 but 1965 should be the same.
Also looking for a second paint color book which I have temporarily misplaced. Might have loaned it to my son. I will try to find it. Then will re-post if anything is different.
Gary might be onto something with the color used...