I realized that the badly butchered 1970 Superlead I've been restoring came with five pointer style knobs on it. The sixth has no pointer. I know that these knobs are somewhat sought after and bring a pretty decent price, for a knob. But I don't know what years and models they would be appropriate for. I'm referring to the knob style that looks like your regular brown plastic, gold or silver capped Marshall knob, but with a small pointer at the base of the knob.