I know this an old thread, but my post deals with a Hinsdale socket set so I figured I’d put it here. Anyway, a few months ago I got started on a Hinsdale 1/2" drive, 4 point socket set. As far as I know, the set consists of ten sockets. I already have eight. I'm missing the 9/16" and the 11/32" sockets. I picked up a few duplicates along the way too. If anyone else is trying to complete this set, send me a PM.
Jim C.