Hello Fred,
Thanks for your research into my lamp base. I have seen the photo's on pressglas-korrespondenz and agree there are similarities.
My base has extra four small legs which the others don't. The base is in clear glass with the decoration in frosted glass. I enclose a photo of threaded top.
I couldn't find the post on the web address you gave me. Is it old or have I missed it?
Regards, Margaret.