Hello jonspencer,
don't trust commercial identifications! Commercial vendors have commercial interest.
The glass you showed is from (Peill-)Putzler in Germany indeed, but not a design by W.Wagenfeld. The form reminds of the "Bonn"-lamp but it has been manufactured only in white glass, not with any ornament.
Look at my photos from an original Putzler catalogue from 1960!
Your lamp is a worksdesign called "Madeira".
I am in research about glass and specially abaut Wagenfeld since 1987.
Best regards
H.Hannes