This is a vintage West Bend aluminum serving oven, commonly known as a bun or bread warmer. 

• It is a three-piece set made of aluminum, including a base, an inner basket insert, and a vented lid. 

• The item is used to warm bread or buns and keep them moist using steam. 

• It can be used on a stovetop (gas or electric) or in an oven up to 350 degrees. 

• The design features a decorative etched pattern around the rim.