Pls help value Gold Shadow Bow

I am new to trying to sell stuff to anyone except the merchants and would like to know what I should expect for this bow:-

Shadow Bow of Shelter
Dmg 15-28 (reqs 10 Marksmanship)
Damage +15% (whilst enchanted)
Armour +7 (vs. physical attacks)

around 10k perhaps...

Cheers for the valuation. Would this bow be considered perfect?

usually req 8 is considered "perfect" for bows... but it's close