The 216 was a dark gray and I'm now convinced that I have the correct color
Wrong. Now Denny my old uncle Jed told me my gray was the correct color and I got it from Jim Carter. I know your's is darker but that is that is what it looks like with years of aging, oil, dirt, and grim.
LOL, just too much fun with this topic, and I'm pushing the button on your rattle can.
Don