Originally Posted by
stausty
Different variations of the Raleigh Pro got different Mark #'s. IV has a sloping chromed fork crown. V has a flat, painted fork crown and windowed lugs.
Correct. The Mark V also went with plain seatstay caps as opposed to the fastback seat lug, previously used on all Professionals from the 1970 Mark II's until the final '76 Mark IV's. The Mark V's - along with the early pre-'70, first-gen Professionals - were the only examples (short of SDBU Pro's) to use anything other then the fastback cluster.
-Kurt