Wow this is really interesting. Being Jewish and Venice being my favorite place on earth this is a puzzle I wish to solve. Of course Murano is one of the districts of Venice where the great Murano glass is blown. There was also a jewish ghetto in Venice.
It would be my guess that the artisans who worked on the glass were jewish, though I see no reason why someone who wasn't jewish wouldn't be able to use them.
You might have some rather historical items there. Please keep us posted as to what you learn about this.
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