I have seen a few (no more than four, I think) weights of the same style. They all had the same sort of large head without antennae and separate from the body. At least one of those I have seen was said to be Murano but I don't recall any specific maker being named.
I am fairly sure that Anne Metcalfe included at least one in her regular "sales catalogues". Perhaps somebody has a collection of the older Sweetbriar literature and can track this down?