Anton, you have to be joking! you've got nearly 200 more bits than I do.
I'd think this is an experimental or trial piece, or perhaps from the "glassmakers' shelves" - where pieces made and designed by workers themselves, not as part of the normal ranges, are sold.
It bears some similarities to my "Petit Fleur" bowl, which is a small bowl of very thick glass, with colours and bubbles, but not in this sort of design. It's also a good bit bigger than my bowl, which is slightly under 3.5" in diameter and 1.5" tall. (sorry, can't find a cm tape measure atm).This piece is decidedly not Petit Fleur, though.