Such a slick design, I love it!! My vote would be for Czech.
ZBS was just an idea -- it might still be Murano
>> Link to a basket in a similar colourway on German ebay with a Murano label (I am not sure about the Seguso / Poli attribution)
Unfortunately, Flavio Poli has turned into a generic word like Holmegaard is used for anything bright with white interior, Loetz for anything iridescent, so on & so forth.