As you say definitely a Petr Hora for Skrdlovice design. An unusual shape for this pattern though. He designed the pattern in 1983-1984. Though I think this ball vase was maybe a later addition to the other shapes, initially a tall vase, ashtray and a wide, vaguely pear shaped one.... He is an interesting designer, still working in glass today and has a website etc.. He was an important designer for Skrdlovice, even becoming director of the factory after Mr Svoboda left, although he provided some designs as an independent designer long before then, in the 1970's too.
Rocco, you do have a nice Skrdlovice collection!