Oxheart Perry's is a pawn shop in The City.
One of the patrons at the Burrick took Bertha's brooch to Oxheart Perry's but lost it in a sewer drain along the way. Now he is worried she will be after him.
Oxheart Perry is inspired by or is a descendent/relative of Heartless Perry from Thief: Deadly Shadows. Black Market Bertha was also a character in that game.