On page 11 of this discussion I posted a burnt orange decor which I have suspected for a long time is Welz. Immediately following that post John posted a very organic form in the same decor, at that point in 2013 it was unidentified.
I recently have come into possession of a Welz trophy vase in a shape confirmed with about 5 or 6 different décors. That trophy vase is the same décor as the examples on page 11 shown by myself and John. The trophy vase, I believe, was sold to a refiner who applied the metal base and the white enameling.
I am of the opinion that this trophy vase supports the idea that Welz made the décor, and that both my example and John's are Welz production. I am posting a couple of image showing my trophy vase, the Vase of John's, and also a couple of other Mica infused décors by Welz.
The green example is actually on a shape which has been identified with discovered production literature as being by Welz.
I would also note that the two example I own, and the one by John, are the extent of pieces I have seen in the décor.
Well..... that only took 4 years!! :-)