I've had a few of these and never been able to pin down a definite maker. They resemble an American (New England Glass Company) Nosegay on a double latticinio ground. For the examples that I have had, the number of strands in the latticinio matches what is expected for NEGC. However, the profile is flat and the quality of the millefiori is lacking. So, I concluded it is either American by an unidentified maker or (you guessed it) Bohemian.
I'm interested in what others have to say about this.