- Hammer of Expertise
- Binds when picked up
- Unique
- Mace
- Main Hand
- Speed 2.10
- 54 - 101 Damage
- (36.9 damage per second)
- Durability 105 / 105
- Requires Level 40
- Item Level 50
Hammer of Expertise is a main-hand hammer that can be summoned by expert Blacksmiths. This hammer does not double as a blacksmithing hammer.
Source
It is summoned from the [Signet of Expertise], which is the quest reward from 
[45] Expert Blacksmith!.
Notes
The hammer lasts for 1 hour and the summon has a cooldown of 3 hours, so you'll have 2 hours before you can summon it again.