Mark Perkins and all,
I had 1978 Raleigh Prof as "Mint" pale Carolina Blue/Silver with high shoulder fork.
I do have 1972 model Silver /Black with chromed low shoulder fork, and rear stay tube meet together at seat post while ones on 78 model were attached side by side.
I am not sure exactly when these changes were made during mid 70's.
KEN TODA, Groomy, mild winter day in central North Carolina.