The back of the tile is marked Welden IWS (IWS stands for Irene Welden Seagroves). Green felt stuck on back of tile.

Origin: Buck's County, Pennsylvania
Artist: Irene Welden Seagroves
Pattern: Bird
Item Thickness: 1/4"
Color: Yellow
Material: Terracotta
Vintage: Yes
Brand: Welden Pottery
Tile Shape: Square
Era: Late 20th Century (1970-1999)
Style: Folk Art
Theme: Bird
Features: Sgraffito
Production Style: Art Pottery
Production Technique: Pottery
Backstamp: Incised
Country/Region of Manufacture: United States
Finish: Glossy
Handmade: Yes
Item Width: 6"