• Formula: Enchant Bracer - Mana Regeneration
• Item Level 58Disenchants into:
  Not disenchantable
• Binds when picked up
• Requires Enchanting (290)
• Requires Argent Dawn - Honored
• Use: Teaches you how to permanently enchant a bracer to restore 4 mana every 5 seconds.
• 1 Charges
• Sell Price: 75
• Vendor 3

Source

This item is a reputation reward; you must be Honored with Argent Dawn to purchase it for 3 from:

• Argent Quartermaster Hasana <The Argent Dawn> in Western Plaguelands
• Quartermaster Miranda Breechlock <The Argent Dawn> in Eastern Plaguelands
• Argent Quartermaster Lightspark <The Argent Dawn> in Western Plaguelands

Patch changes

• Patch 1.6.0 (12-Jul-2005): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB