I do not know why for sure, but my gut is saying not Kralik on this one. A little crude in the detail, at least it appears that way in the images, and the coloration of the iridescence makes me lean that way. The iridesence reminds me of Grenada and Pepita by Rindskopf, although it is neither of those decors.
IMHO the UV reaction does not point any specific direction.... I also think it to be earlier than the 30's. Closer to 1900. If it were Kralik and the Deco era, the quality of the work would be much better, as that was one of their strongest periods....
Craig