There is a green version of this tile in the Philadelphia Museum of Art, here The tile has a hole in the top for hanging (as does the museum example). It is illegibly signed on the back.

Origin: Pennsylvania
Pattern: Seal of Mohammed
Color: Blue
Material: Clay
Brand: Enfield
Type: Decorative Tile
Theme: Islam
Style: Islamic
Production Style: Art Pottery
Time Period Manufactured: 1900-1919
Production Technique: Pottery
Country/Region of Manufacture: United States
Finish: Glossy