The arched mark is still believed to be associated with Kralik. There is now a second oval mark found which is a slightly different shape and found on glass not indicative of Loetz production. The glass generally speaks to which oval it is....
I have seen so many images of straight marks that I really look at glass more than marks in many instances..... There are a variety of fonts used in straight marks, and the appearances of several application methods. My gut feeling is that using straight marks as an indicator without the utmost caution will likely result in quite a few incorrect attributions....
As an example Welz is also found with a straight line Czechoslovakia mark, with a smaller size and a different font than one generally associated with Kralik. If one does not know the differences in the marks, a straight single line Czechoslovakia mark can actually describe several different versions.
In addition to a section showing known marks and labels, I have been working on a section for the website which will show a whole bunch of different marks and associated vases they are on, which are currently not known to be associated with any company. There is still the unanswered and nagging question of how many of these marks were actually applied by exporters and not glass houses.... We will likely never know the answer to that question.
Hope this helps.....
Craig