Somehow I missed this post originally, which is annoying. I have this set, in a partial box.
I had thought the box was the wrong box because it seemed the set didn't fit well in it, but seeing Bob's,
that appears to be the way it was...interesting...
(Mine has sizes on the sockets in addition to the A number, on one of the hex flats.)
I also have an A10 swivel joint.
(I don't have a set model number, is I have no lid, so the swivel may be a different set...)
PS: Bob, do NOT clean these with *anything*, whatever that black coating is, it dissolves in everything...