You prompted me to make a second scan of the MuranoZoo, but I don't see anything helpful. No examples with this foot, and not really anything notable as being with the same techniques.
What I DID notice in the zoo was the label Segus VDA label which features a white bar!! This DOES look like a link between the two!
I've asked several times why the label (on mine) has a white bar that seems to be there for some handwritten text (number), and it looks like Seguso also did this! (briefly).
Perhaps it was their idea to combine the makers label and the stock-number?!