PC Rare Crippling Wingblade Sword

Anyone have advice what I should do with this sword, or how much to sell for?

Crippling Wingblade Sword RARE
Slashing 15-22 req. 13 swords
Dmg. +14% while in stance
Lengthens crippled duration on foe
Value 516 gold

This is the first time I have ever seen an item with such a high value, yet no good mods. Possibly highly salvageable?? Again looking for ideas.

Thanks

Should i just sell to trader for the 516