The region where it's made and it may be the brand-name as well. "Curds and Whey" is a stand at the Queen Victoria market in Melbourne which sells bulk butter - they have huge blocks of butter and they cut pieces off when you buy some. This butter is not labelled with any brand but is labelled as being Warrnambool butter.

There's a major dairy at Warrnambool which produces butter which is sold under the brandname Warrnambool in supermarkets.

I have no idea if these two butters are the same!

Confused yet?

That's easy - Myrtleford Butter. http://www.thebutterfactory.com.au/ - they sell at farmers markets in Melbourne, listed on the website. It's an expensive artisanal product and it's divine. They're generous with samples.

Audrey