Ivo, I was going by the information on the Kilian site under a glass which is pictured above it (and looks to be the same as mine) -
Römer aus dem Tafelservice WILHELM. Rheinische Glashütten A.G Köln-Ehrenfeld um 1888. Schwach grünes Glas. Schaft mit eingeschlossenen spiralförmigen Hohlfäden. Abgesetzter Nodus. H. 19,5 cm
Lit. W. Schäfke: Ehrenfelder Glas des Historismus, Köln 1979, 180, Nr. 435.
I couldn't see in that description that there was a doubt about the origin of the glass? I thought the wording
Lit. W. Schäfke: Ehrenfelder Glas des Historismus, Köln 1979, 180, Nr. 435
was a reference to where the identification came from?
Also in the other link, the glass I referred to was three down on the left. That one does not have 'ahnl' written on the description, it is id'd as Wilhelm and is the one on the page that looks exactly the same as mine. The others that have 'ahnl' written under them are all slightly different to that one and to mine.
Did I misunderstand?
m