The image appears to show a fragment of unglazed earthenware, likely a cylindrical protrusion attached to a flat, pedestal-like base. This is highly likely a piece of a "cylinder haniwa (entou haniwa)" made during the Kofun period. Shape Characteristics: Cylinder haniwa were lined up around the mounds of ancient tombs (kofun), and some had various decorations on their upper parts and sides. The object in the image also shows the cylindrical part and a portion of the base (pedestal) used to stand it on the tomb. Material: The unglazed earthenware matches the characteristics of haniwa. Purpose: During the Kofun period, they are thought to have been used to mark the boundaries of the tombs and for ritualistic purposes. Discovery Location: Since haniwa are mainly excavated from tombs, it is highly likely that this was discovered in or around a tomb. I believe this was collected within Gunma Prefecture. Height: Approximately 10 centimeters Width: Approximately 12 centimeters Thank you for viewing.