PC Max Damage sephis axe

Gold Shocking Sephis Axe of Axe Mastery
Lightning damage: 6-28 (rq.12 axe mastery)
Damage +18% (while health below 50%)
Axe Mastery +1 (15% chance while using skills)
Value 260 gold.

I feel the value is understated somewhat.

What do you guys think?

I've got an image link now:

http://www.mjhorsfield.f2s.com/Axe.jpg

Sold in-game 10,000gp