hi i have an item that needs a price check but i want 1 quick if thats ok. I have a

Gold Stormbow Of Enchanting
Dmg 15-28 Req 10 Marksmanship
Damage +15
Armour -10 While Attacking
Enchantments Last 20% Longer

The dmg +15 and armour -10 are unsalvagable which i gather is a bad thing but any help is appreciated thanks