Kenshi's Butterfly Daggers

Kenshi's Butterfly Daggers is a Unique Item dropped by Kenshi Steelhand in Bukdek Byway.

Weapon Stats
Daggers
 * Slashing damage: 7-17 (req. 9 Dagger Mastery)
 * Damage +15%
 * Energy -5
 * Energy Gain on Hit: 1
 * Energy regeneration: -1
 * Armor +7 (vs. Physical Attacks)
 * Both hands

How much are these WORTH!?! I have some but I don't know how much to sell them for. If anyone knows, please PM me. Angemessen Verzog. (btw, sorry wikipedia guys for messing up the page...)