It has been recommended to add possible countries to the title to yield specialist interest. I hope this is OK with everyone. According to researches by GMB members such as Jindrich, Skrdlovice always had a flat base, so probably ruled out. All Chribska I have seen has had a flat base but GMB members may confirm whether this was always true. As Michelle has suggested, the style of the vase looks very like Chribska style and if the base was flat I would be tempted to suggest it. Maybe some opinions of more broad experience may have a view to contribute, since I am wondering, that companies such as (unsigned) Val St Lambert or (unsigned) Chalet is equally possible? I suggest this since European makers did borrow some deign ideas from each other and the base suggests some possible ambiguity at the moment. I hope somebody can confirm if Chribska sometimes used this base finish because that would be a simple and effective answer, if correct. It looks a finely made heavy vase and I am sure you will identify it eventually, with help from this community,
bOBA.