I received an inquiry about a strand of these beads I have on offer, and referred him to Augusto Panini's website -
http://www.glass-beads.it/venetian/details_06.html
Also mentioned that the term "French Ambassador" was a misnomer, from a mistaken belief that these beads were used in the North American fur trade.
But is that correct? Does anyone remember any of this lore, or am I going to have to do a trawl through the archives?