Hey susiecat! Glad you have come to the forum with your interesting collection of treasures!
Dimensions on piece? Does it look as if it ever had a lid (wear marks)?
Just a helpful suggestion: When photographing some small to med size pieces if you put a common item next to it for proportion helps people get a grasp of the piece a bit better if you don't readily have the measurements. (example: a soda can next to a larger piece, a coin or dollar bill next to a piece laying flat on a surface, etc.)