Was the stainless steel trim used on the rear of a '68 Charger chrome plated?

I concerned mainly with the vinyl top belt mouldings which butts to the pot-metal "check" trim

...and the longer stainless trim mouldings for the trunk lid and the lower tail lamp panel.

I recall years ago buffing mine and I swore I broke-through a layer which appeared to be a plating of sorts.

Thanks,

John