r olson I was just looking at that ratchet. My best guess would be S-K made like the Chrome Alloy line with those rivets in it, although most I have seen had the crimped on selector like the one you showed from AA.
As far as Duro, they (like their Western Auto Westcraft counterpart) also have a crimped together two piece selector, other than the push through ratchets of course.
Here is a completely unmarked ratchet I found. It think it is Chrome Alloy or at least made by S-K. I've seen quite a few of this style ratchet. Bent and missing the selector unfortunately, must have had a rough life.