Thank you so much for the link. All of these came from the same estate, and were hidden deep in a cabinet in a basement family room. Based on the stuff that was in front of them, and the amount of dirt that was on them at the time, I am pretty sure that these were a set purchased by the owners together, and not accumulated over time. They were the only ones in the very large house. The people having the sale had not even found or seen them they were so buried. They are all identical with absolutely no physical differences, and the bottom ring is ground and polished in exactly the same way... I would have never thought that the pattern was produced by so many different companies though.
I did take quick look around the internet and they seem to have been made in slightly varying sizes by different companies. Maybe my further research of the pattern and height together will reveal a manufacturer, or at least narrow the field.....
Thanks again, Craig