This is a mountain tea bowl from the late Kamakura period to the Nanboku-cho period (13th-14th centuries). It has a shallow, open bowl shape with a gently undulating rim that retains the momentum of the wheel-throwing process. A thin ash glaze, likely from natural glazing, covers the inside, with a partially greenish appearance. The clay is coarse, and the firing is rough, giving it a simple, rustic appearance typical of mountain tea bowls used as everyday utensils in the medieval period. Size ・Maximum diameter: Approximately 15.9cm ※Please note that there may be slight variations due to amateur measurements. Condition ・Small chips and scratches on the rim ・Overall unevenness, clay texture, and signs of use due to firing ※Please understand the nature of medieval pottery before purchasing. Notes ・Authentication certificates are not included. ・The period assessment is the seller's opinion. ・Returns and cancellations are not accepted. ・As this item is also listed on other sites, priority will be given to the first buyer in the event of simultaneous sales.