Keith:
Your good taste (10 year old, single malt is only superseded by 12 year old etc) forces me to come to your help. I think that Anita was dredging her memory (she's seen it before) in a gallant attempt to help you anyhow.
The decanter is from later in the 19th Century by Jenkinson's Glass, which became Edinburgh and Leith Filnt Glass, and then Edinburgh Crystal. I'm not sure of the exact date. It was made at a time when the company brought over a glassblower, or more, from Murano to help them diversify. The experiment eventually petered out. The piece belonged to my uncle who was a glass cutter for Edinburgh and Leith before emigrating to Canada post WWII. He was given it through his father who, along with his grandfather, had worked for the same company. My uncle had said that he had an aunt who had a cupboardful of similar pieces, including reticello, but she didn't like it as much as cut crystal so she threw it all out.
My aunt, one of the sharpest people I know, was told in the 1930's, that the white came from seagull feathers melted in glass. She was taken in enough to repeat the story to me a few years ago. I laughed so quickly that I had to tell her about "feathering."
It's a piece that I think eventually should go back to a public collection in Scotland. Anyone have any ideas?
Thanks for trying, Keith. Hope you like the story, and, yes, I'd be happy to buy you a single malt of your choice should we ever meet.
David