Plate of Balduran

Plate of Balduran is enchanted full plate armor +2 which boosts the Charisma of the wearer by 1 and raises the maximum amount of hitpoints by 4. This armor provides an basic armor class of -1 and the normal bonuses to armor class against specific types of attacks. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.

It's sold at the Adventurer's Mart by the lady who sells the unique items.

In-game description
"Plate of Balduran This plate was worn by the famous hero Balduran. It is part of a set of weapons and armor that was stolen from the museum in the city of Baldur's Gate."