Rindskopf Very Iridescent Oilspot Vase

I purchased this vase at an auction, and was so pleased with it when it arrived. It is so incredibly iridescent (over a very dark amethyst glass) that it is hard to photograph. It is a nice simple but pleasing shape, and 6.25" tall x 3.25" at its widest. From the research I have done, I believe it is most likely Rindskopf rather than Kralik, but I may be wrong. In an older post on CW, Alfredo describes the Kralik oilspot vases he owned as being very light in weight (he said almost 'eggshell'); this vase is quite substantial. If anyone thinks it is one vs. the other, please let me know, thanks!