I have seen several of these lamps during the last year (different shades of brown as far as I remember).
I nearly bought a brown one some weeks ago which had an interesting label reading "Picking" --> same label as
the one in this ebay auction, which is unfortunately too worn to recognize anything.
But I couldn't refuse this beauty today at the fleamarket despite some chips to the base at 2,- Euro.
Height and diameter of the glass part appr. 19 cm, cloudy pattern of dark blue
and purple (two different colours seem a little unusual

)
Quite thick glass, inside satinated, smooth rim, ground and polished base.
The light fixture is made of brass, and similar to WMF Ikora lamps there is an additional light source within the lamp base.
Glasmanufaktur Picking (according to Pressglas-Korrespondenz) seems to have been a maker.
On the other hand the shape looks identical to the Walther Oralit "Lotus III" vase in this Walther catalogue on pressglas-korrespondenz.de
>> Link.
The rim finish would suggest a vase as well...
Any more info highly appreciated as usual!
Thanks,
Michael