A beautiful large gray speckled graniteware platter.  Just over 18" long X 14" wide.  It has a nice deep cavity, 1 1/2" deep.  There are some worn spots, along with a few chipped spots.  The platter looks great.  It could be used or make a wonderful wall hanging.  
 
Graniteware describes enameled metal produced throughout the Midwestern and Eastern United States from the 1870s until the end of World War II. Patented in 1848 by New York inventor Charles Stumer, graniteware was known as agateware, enameled ware, and speckle ware.