Eternal Shield q9 strength +10 vs undead -3 while hexed

The question everyone is asking I am brave enough to ask :

What is the merchant gold value?

If it's 200 300 400 g. I can see a realistic market value for the item. Also maybe a 128 or 256g can help. If not put it for sale and see where ist goes. Maybe we got UW, SoO and FoW experts here that know if the - 3 is a desired mod in combination with undead.