The last B&W TV made for the USA?

[AUdubon5425]

I'd say that's probably it for anything larger than those 5" $10 Chinese drug-store specials.

The last 12" B&W I've seen personally were knob-tuned from the early 90's. (I think KTV was one brand that ran off a wall wart transformer.)

I think 19" B&W sets were done by about 1982. I know RCA and Zenith marketed them at least through 1981. I've seen references to 23" sets being made as late as 1981, but haven't been able to confirm that.