Hi and welcome to the forum.
Yes, I think your dating is fairly close. The amethyst tint suggests the presence of manganese as a decolorizing agent.
See this post for more info: https://forum.antiquebottles-glass.com/discussion/comment/344#Comment_344
I am not entirely sure of the country of origin for this bottle nor am I sure, if AU, whether the change in glass technology occurred at the same time as in the US.
Chris