Current Blackhawk is Stanley owned. It's currently being maketed as a sub line of Proto, basically marketed as Proto's little brother. A lot of what I've seen recently with newer Blackhawk is Taiwan and China made stuff.
It's still being marketed as an industrial line of tools like Proto is, but it appears to be more an economy line of Proto.
From what I've seen of the new stuff I'd rather avoid it and just buy Proto being that Proto is still a great quality tool, with most of it's basic line being still USA manufactured.
I have some old USA made Blackhawk stuff that was made probabaly in the 50's and 60's and what Blackhawk made then was certainly no economy grade tool. High quality in all aspects. The company who made those old Blackhawk tools no longer exists. New Britain Tools also later owned and made Blackhawk tools as well. I have lot's of New Britain branded stuff, it's great quality. Sadly they no longer exist.
Not all black oxide finished sockets and extentions are impact. It will usually be stamped "HAND USE ONLY" if they are not and I know Proto is pretty good about marking tools as such. A whole lot of my Proto hand tools (sockets, extentions, and combo wrenches) are black oxide finished. It's less espensive, and even though the oxide finish does wear off with regular use and handling, rust or corrosion have never been a problem.