I also think that's likely to be S&W 'alabaster'. It has that look and the glass itself has that remarkable something which gives it a sheen no other maker I've seen has on their opaline glass.
Is it possible (I know, I'm annoying) to have a picture of the pontil mark where the light shines on it so the size can be seen for comparison please?
S&W 'alabaster' range was made over a long period and in my experience it does vary slightly in terms of appearance. Not it's translucency but I think whoever was blowing it at the time had some say on what it looked like. I have some pieces which are tiny, quite thin and with the white stems etc, and then others that are really quite thick with a variation on the colour within the body of the piece. One which is almost Dragon's blood red on the interior but very pale on the exterior yet it's not possible to say it was cased by looking at it for example. I think once it got to the inter war years or the 1930s fashions changed.
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