Pewabic pottery was founded in 1903 by the artist and teacher Mary Chase Perry Stratton and Horace James Caulkins, her business partner. The company is well known for the unusual iridescent glaze covering the pottery and tiles created in a manner outlined by the International Arts and Crafts movement. In 1991, Pewabic Pottery was designated as a National Historic Landmark. 4"x 4" tile coaster.