Buckley's Buckler

Buckley's Buckler is an enchanted Buckler sold at The Friendly Arm, but only in the Baldur's Gate: Enhanced Edition version. In addition to the normal Buckler properties, it offers +1 to Constitution so long as it is worn.

In-game description
"A rectangle of mammoth hide forms this small shield. No amount of cleansing can dispel the pong of decay from this poorly tanned device, yet somehow the malodorous shield fortifies its wielder."