What I mean:
1.) I don't feel good about this sale. I don't know why the OP does not have a photo of the forearm. Something is funny here.
2.) I know for a fact that Richard did not sign every cue he has made
3.) I think the early years are when he didn't sign. Key word THINK. Implying that I am not sure.
Your post proves that in 1983 he signed your cue.
Unless he signed it with a white pen, I doubt you will be able to see it on an ebony cue in a pic. It will be one that you have to look for. Cue has logo on buttcap. I would get a good clear shot of the buttcap. Good luck with your sale.