• Helm of the Restless Watch
• Item Level 245Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Plate
• Head
• 2009 Armor
• +103 Stamina
  +103 Intellect
• Meta Socket
  Blue Socket
• Socket Bonus: +9 Spell Power
• Durability 100 / 100
• Requires Level 80
• Equip: Improves critical strike rating by 66.
  Equip: Restores 45 mana per 5 sec.
  Equip: Increases spell power by 131.
• 

Source

This item is sold by the following vendors for 75 :

•  Magistrix Iruvia <Emblem of Triumph Quartermaster> in Icecrown
•  Magistrix Vesara <Emblem of Triumph Quartermaster> in Dalaran

Patch changes

• Patch 3.2.0 (04-Aug-2009): Added. 
  

External links

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