Art Glass-Cobalt Blue and Green. Hand blown? ID or comments please.

These pieces were part of a set, we were told, purchased by my Great-Grandmother between 1890 to 1910 in the U.S. All supposedly made by the same artist. Some have a swirled pattern. All have what I am told is the indication it was hand blown by the cut off mark on the bottoms. I realize it is probably impossible to identify the artist, but maybe someone would have an idea, at least of style type and period. For what it is worth, she was a Czech immigrant from Austro-Hungary. Perhaps this influenced her choice. Thank you very much for looking.