Here is the frame I have now, I havent managed toc onfirm whether the paint is original, it has some unusual features though such as race number hanger and cable guides along the side of the top tube. The race number hangers normally appear on the team frames but I have come across nothing in this paint scheme.

It has the other normal features, "R" cutout on BB and cable guides under BB.
"R" on lug bottom of headtube
"R" in pentagon on Brake bridge
"Rossin" on seat stays
"R" in pentagon on top of fork crown

Most of these are early 80's features, its labelled SLX but I think its probably SL looking at the BB and rest of the frame

I would appreciate any comments or feedback on possible age , origins ? S/N = K1 210