Hello everybody,
I know, I´m a little late, but I just came across this nice topic. So, the ashtray was sold by WMF; but the question remains: Who produced it? Haven´t also seen an alexandrit-item from WMF so far and I don´t think they were able to produce neodymium themself. Wouldn´t also be very efficient to produce this expensive colour in this small amount only for these (pressed) items.
WMF was one great customer of Hesse-Glasworks (HG) at Oberursel for quite a while; HG produced many smokey grey and champagne-coloured products for WMF (and "Rosenthal" by the way too). Ivo´s red ashtray reminds me very much of the HG-neurot and HG was producing the alexandrit-glass up to the 80s too. This might be the solution for the WMF-Neodymium-Mystery. I´m still in touch with a former HG-glassmaker of the Hessenglas "pressing-section", maybe he recognizes it.
Oliver
www.kristallglas-oberursel.net