I know there is some chance of an item like this spawning, but it's super-low. My hunch is it should be higher.Platemail Gorget / FORTIFICATION & PROTECTION (50 Charges)
Additionally, I don't think protection items can spawn here with 50 charges, but sounds like the should.
From my research, it looks like up to 200 charges for Item ID, up to 20 charges for Teleport, 50 for weapons (??), and up to 100 charges for anything else (night eyes, etc).