well - seriously? I’ve got a few original MT-500 but i’d in NO WAY describe their case-color somewhat like “brown” in any way nor black either (the videogame radios are, but these weren’t mt-500’s). It’s more like a pretty dark grey with very slight turqoise tint or even a bit of olive maybe. If i had a pantone palette, i could make it more precise i guess, but please don’t make a chocolate radio :-?
I’m wondering how much of that greenish tint might be due to plastic yellowing if itcontains bromine.
After cleaning off decades of its original owner’s paint marks, I resprayed the one I got from eBay with vinyl dye. I had the choice of what Halfords call “light grey” or “dark grey”, but had the feeling it should have been somewhere in between, so erred on the lighter grey with the assumption that over time, natural dirt migh make it look darker.