Hi Trudy,
I'm not sure whether the attribution is right in this case. Mrs Graham's work in Australian glass was groundbreaking, but she was working at a time when there weren't even photocopiers, let alone computers, scanners, etc. She also did not have the benefit of seeing all the catalogues and worked instead from newspaper and magazine ads, spending several hours every evening for years reading through old Arguses and Sydney Morning Heralds. However, on occasion she has also worked from guesswork and it is sometimes hard to tell from the text whether she had good evidence for her attribution or has just gone by feel.
To me, the colours seem wrong for early Australian glass. I'd put a question mark next to it for the moment.