A photo would be good. The Standard describes combs in thousands of words of explanations and drawings. Just another reason to own the Standard of Perfection.
Just remember, that a comb is a small cut meaning a small deduction. I do find that an ugly comb or severely faulty comb often drags down a bird in the judge's eye that to me, a great comb remains much more important than the mere 5 point cut implies.
Yes, the standard for the single combed Plymouth Rock is 5 points.