Austraila's Round 50 cent coins

[trout]

I found this coin recently and I have posted it in the main part of the forum But it won't hurt to have it here in the public section as well
This is one of the original 1966 80% Silver coins that are pretty common and are basically Bullion coins in the lower grades.
What makes this one a little bit "special" is the well defined "Double Bar" behind the Emu's head, Most coins don't have this or it is usually ill defined.