I have been working to assemble an archive of all the reynolds 531 decals for the 1960's, 1970's, and 1980's. The ultimate goal is to have scan-quality images so that different decal makers can compete to make the best reproduction decals.
We have images of most of the (but not many french decals) in this era, and the file names indicate the time periods for each decal.
http://www.ece.ubc.ca/
http://www.ece.ubc.ca/
Is the correct decal for your bike, i believe.
- Don Gillies
San Diego, CA, USA