Similar decors are believed to have been produced by Kralik, Ruckl and Welz......and possibly others.... I could not find another example of the shape in a different decor.
A straight line mark was used in many forms, and there is not enough detail in the image of the sig that it points any direction. As an example, both Welz and Kralik are found with a straight mark, but the fonts are different, and also different sizes....
Craig