Presented here for your consideration is a wonderful Benedikt von Poschinger, Kristallglasfabrik Oberzwieselau Jugendstil Tazza.
Designed by Carl Georg von Reichenbach, c. 1906-1910. Marmoriertes like glass cased with clear, with applied green threading, and applied purple cabochons. This is a large Tazza, coming in at about 7-1/2" tall x 11-1/4" wide, first photo has a U.S. quarter dollar shown for size comparison.
I found but one other example in a Dr. Fischer Germany auction catalog (Lot 445, 10/12/2013), the last photo shows this lot, and their lot description is copied here from their auction catalog:
"Tazza Georg Carl von Reichenbach (Entwurf), Kristallglasfabrik Benedikt von Poschinger, Oberzwieselau, 1906 - 1910 Weißgraues, hellgrün geädertes Opalglas, farblos überfangen, grün umsponnen, mit vier großen und acht kleinen 'Batzeln'. Auf der Schale vier tropfenförmig auslaufende grüne Appliken. H. 20 cm D. 28,5 cm Lit.: Passau, V.47 ff.
A Tazza with cabochons Georg Carl von Reichenbach (Entwurf), Kristallglasfabrik Benedikt von Poschinger, Designed by Georg Carl von Reichenbach, Kristallglasfabrik Benedikt von Poschinger, Oberzwieselau, 1906 - 1910 großen und acht kleinen 'Batzeln'. Auf der Schale vier tropfenförmig auslaufende grüne The clear and opalescent white-grey glass striped in pale green. With applied threads and cabochons in green and transparent. Height: 20 cm diameter: 28,5 cm"
Here's a short bio on Reichenbach:
"Reichenbach was born in Munich in 1872. He signed his work as Irgl Reichenbach, and he's mostly known as an interior designer. Studied at the Kunstgewerbeschule in Munich and later he studied with Obrist and Debschitz, and at the same time he learnt the craft of glassmaking at the Benedikt von Poschinger's works. Later he set up his own workshop in Berchstesgarten and later in Tegernsee, where he produced furnishing items: furniture, clocks, textiles, glass... In fact it was his designs in glass (both artistic and utilitarian) that made his name as a designer. "