Blair — What a lovely piece.
There is nothing like it in Newby,
From Palace to Parlour.
I have no doubt from your brief comment that you have read Hajdamach pp394–400.
I cannot offer any help directly, as this type of glass is outwith my experience. I suggest that you seek the assistance of Simon Cottle and his team at Sotheby's, London, and Roger Dodsworth and his colleagues at Broadfield House Glass Museum, Kingswinford. I know Roger is in regular contact with another authority who knows the S&W factory pattern books intimately.
Good luck.
Bernard C.
