No, I don't go along with that to be honest.
I've Stevens and Williams alabaster pieces that date to from 1914 and they have beautifully finished and polished pontil marks for example.
The pontil mark doesn't look right to me. I mean it might be a feature of a particular range of glass (trying to make it look old etc) but generally I wouldn't think S&W were making stuff with unpolished pontil marks.
John, if you're reading, do your pieces have polished pontil marks?