I am pretty sure this was a minor oversight by the programmer, but it seems that the duck shield seems to have wrong stats. Although I might be reading this wrong, from what I can understand from reading about armor in Wiz 6, it works the old fashioned "THAC0" way, where the lower the score the better, in this case it seems that the Duck Shield mistakenly adds +2 to your AC instead of -2, it's listed as -2 in the clue-book which is very strange since, well you know; it's the CLUEBOOK!....lol

It's not a bug. It's the way the old "reverse" AC worked.

You subtract the AC bonus. This means that a "-2" actually increases your AC by 2 (because you're subtracting a negative) - which in that system is bad.

actually nm I figured it out, the Duck Shield is bad...cluebook was actually right....I just don't understand why the vendor sells it...makes no sense considering shields in this game are VERY far and few between

I'd say this is a joke; the duck shield makes you a sitting duck. :)