I recently bought it, and I think it's very beautiful. Due to the mottled character of the glass, it's hard to detect whether the base has any wear. The shape feels 50s-60s (but it could be retro of course). The seller thought it was a 50s Prachen vase. I have one other Prachen, but that one has a different rim, so I'm not assuming anything at this point.
Size: definitely XL with 35.5 it's the highest one of my collection. 9 cm diameter at the base, 11 cm diameter at the widest point and 6.5 cm diameter at the rim. The rim is quite neatly polished, with extra finish on the inner and outer part of it. I'm not sure what to call the mottled technique that is used on the outside (but please enlighten me).
Any ideas, speculation, etc welcome!
Astrid