I had never heard of the company but I knew I wanted them but now I can’t find anything about them online.
If you mean the company, I posted a trail of historical tidbits extracted from Google Books in the very beginning of the thread. Plumbing service supply (parts, tools, etc) company founded in Scarsdale, NY in 1921, still in business as part of the Home Depot Group since 2015.
If you mean the jars, no clue. Very unusual in my experience. Sexauer parts storage systems came in all shapes and sizes, from small metal cases to large wooden cabinets. I dare say all of us of a certain age are probably still storing some hardware (brads, nails, nuts, bolts, screws, washers, cotter pins, snap rings, etc) in glass jars (pickle, baby food, etc), just like our fathers and theirs before them, but those were repurposed. I was not aware of Sexauer or any other supply company originally packaging parts for retail in them and I have no idea when those were made. If you spool through the thread you'll see various Sexauer merchandising color schemes, fonts, and logos on things collected and posted and you may be able to date the jars to an era that way, but nothing about those labels is jumping out at me.