Now the item in question is safely sold on that well-known international auction site, I can engage with this discussion...
This item is definitely a collaboration between Chris Pantano and Judy Harris, as Ross (ahremck) has speculated. Judy Harris learned to blow glass with Peter Minson in the very early 1980s at the Paris Creek craft workshops near Adelaide. She produced items both on her own account and in collaboration with Minson. The first image below shows their joint signatures in their respective handwritings.
A few years later, Harris moved to Chris Pantano's operation in Queensland. Pantano had extensive experience in kiln working glass but, inspired particularly by the example Peter Goss who operated a successful hot glass studio nerarby, he wanted to engage with blowing furnace glass. Thus began the productive Harris-Pantano collaboration. There is an extensive and illustrated article recording their collaboration in the journal Craft Arts, volume 7, page 54. The second photo below shows a small vessel in the same style as many of the items illustrated in that article.
The third image shows the marking on that vessel in what I believe is Chris Pantano's handwriting. (It's not a great photo, I will agree.) By contrast, the markings on the original query item of this thread are made in Judy Harris's handwriting, as can be seen by comparing it with her signature in the first of my images.