[Arran]

The 15/17 chassis-note the small bubbling on some of the cans.
Usually the chrome on McMurdos is pretty good vs a Scott

I've noticed that as well, there are scores of Scott chassis with pitted and bubled chrome even when the cabinet and everything else was reasonably good. I've only seen one McMurdo first hand but knew a guy in Alberta that had a half dozen Scott radios/chassis and sure enough even the good ones had a few spots here and there. I think Scott flash chromed their chassis and hardware, meaning that they skimped out on the copper and nickel plating that you would typically see on a car part, and plated the bare steel. They used to do this with cheap bicycle parts from Hong Kong and Taiwan, not uncommon for those to rust if they got wet just once. Then you have Wells Gardner made sets with chrome and they still look decent more often then not, same with Atwater Kent.
Regards
Arran