Yes, I finally got myself a roundie courtesy of drh4683! I figured I needed a new color TV to go in my new house
It's a Zenith model 5311U with a 24MC32 chassis he scored at an estate sale.
He said it does not work (no B+) but the original 21FBP22 tests strong.
It has a vinyl clad metal cabinet and looks to be in very good, all original condition.
Here's are some photos from the ebay listing and it arriving in my garage.