Thanks Mick. It's not so much restoring the colour, as removing the years of grime without '
also' removing the colour.
One option, as I have done with a few other sets where the finish was beyond repair, is to re-cover it. I am hesitant to do so with this, as generally the P5A is a good, working, & otherwise untouched set, and I would like to restore it, bring it back cosmetically to as-was.
Not 'gotten' American, (Gotten is a middle English word that we simply don't use anymore) I've just a 'multi-national' life history - well travelled