FWIW, I recently bought a Brown and Sharp Size #0 style DH from grizzly tools ( their smallest model). Haven't really used it yet, but it looked and felt tight and accurate when I inspected it close up. It is undoubtedly Asian made, as is almost everything these days, but it seems like a good price and more than adequate quality.
BTW, I choose this new Asian DH over all the used, online, old American stuff because I got throughly fed up looking at all the equipment these on line tool sellers had striped of the required accessories - no tailstock, no dividing plates, no workholding, etc. Go this route and you end up paying twice as much as the DH is worth buying back all the accoutrements. And if you don't, the fabulous old "Mercian made" tooling ends up being just useless junk. So nope. I bought a complete kit from Grizzly for my small mill at more than a fair price and have been happy ever since. Hmm, I am ranting a little bit. Sorry. Sometimes these make a buck tool wreckers get under my skin.
Glenn