Cuda2k I will try and put together a set of 1970s to early 80s 531 variations. I spent weeks learning the small details and only with the help of one fellow on CR do i know what I know now. Just focusing on english 531 decals excluding the 4 star decal above which appeared on both Schwinns and Raleigh/Carltons there are at least 5 significant changes. I will add the photos as I find them.
1. Basic 531 tubing decal late 1960 very early 1970s

2. Addition of lower band with "manufactured by" 1972-1974ish


3. Addition of Registered trademark mid-late (1975-1977)



4. Company changes to Ti Reynolds (1978-1981)

5. Late 1970s 531 tandem tubes