Hey mate! Shipping to AUS is no problem, I've shipped several watches there before. Here is what it would cost:
-$16 untracked/uninsured (10-15 business days) -$36 tracked/$50 insurance (6-10 business days) -$43 tracked/fully insured (6-10 business days)
When I ship internationally the buyer is responsible for the risks of shipping. I've never had a package fail to arrive, but I would still recommend the insurance. Additionally, I will only accept a PayPal Friends and Family or Venmo payment because I have been scammed before on international sales through Goods & Services.
If you cover the full shipping cost of your preferred method I can come down to $255 for the watch.
I'm heading to bed, but let me know your thoughts and I'll get back to you in the morning!