This is a 25cm. "Halle" vase as shown in the 1937/38 catalogue P.45. I think this is "smaragdkristall" (emerald) which is mentioned in the bottom pages but not shown. I previously posted a pair of these in uranium green. It does glow under UV light but is inconsistent, however I think it does contain Uranium which may be "masked" by another colourant. Walther also made pieces in "smaragdgrun".