Because of those similarities -- and the fact that I've lived here long enough that most of the existing differences now seem "normal" to me -- there's not a lot of things left that make me feel more "American" than "Australian".
But, this is one of them.
To an American, this seems like a shop in a strip mall that's offering walk-in surgery. A little odd, but -- eh, why not?
If you click the photo to enlarge it, you can read the phone number. So maybe you have to make an appointment before you get operated on.
But an Australian would not see this sign as odd.
This is because in Australia, a doctor's "surgery" is what Americans mean by the "examination room".
So basically, this sign just means "Doctor's Office".