Nice Hat...

Objectives
Don Carlos has inadvertently challenged you to defeat his younger self in Old Hillsbrad. Afterwards, bring Don Carlos' Hat to him in Tanaris as proof.
 * Don Carlos' Hat

Description
My hat? Yes, it's an unusual style, I know, from far away... few tailors here know how to make them.

When I was young and hot-blooded, I wore it as a standing challenge. Many came seeking to defeat me and win it for themselves... but no one ever did.

Ah, but those days are long past. I'm an old man, now: I drink, I fish, but I no longer duel.

Rewards
You will receive: (or if completed at level 85)

Progress
I was unbeatable, in those days... proud, and rightly so. No challenger ever won this fine hat...

Completion
My... my hat! But... how did you...?

Well... no matter. So, now you know my secret. I WAS beaten... once. Here: take this hat, in return for mine. You've earned it.

Gains
Upon completion of this quest you will gain:
 * 12000 experience