I went to ebay and purchased a 531 decal that I thought was correct for my 83 Woodrup. As the saying goes, I was dumb, fat and happy.
Then I read this thread. Now I'm educated, depressed and confused.

I had no clue there were so many Reynolds 531 transfers. But I guess if I want to play with the big boys, I'd better learn. So let me express my appreciation to nlerner for starting the thread and to Kurt and all the other posters on this thread. I think its time for me to write Woodrup and find out what Reynolds 531 tubing they used to make my bike.