Here's one. I think this is BBQ Boys. You can actually see the orange tinge if you look closely.
Now, it seems weber still made these in regular red at that time because we have seen so many others that don't have any hint of orange in them.
Burnt Orange would have been a sweet main kettle color! Is it my eyes or is this Ranger two-toned? The shade looks like it is in the same spot you see on the avocado kettles of the same era?
Duke, this burnt orange color could corroborate your theory of the "orange 22" kettle in the waterfall pic of the 1972 version of Barbecuing The Weber Covered Way cookbook.