I found this during a cleanup at my parents' house. Is it a square tokkuri (sake bottle)? Or a vase? It's a Showa-era retro item, and it's unclear whether it's a square tokkuri or a vase, but I think it's probably a tokkuri. Height: 17cm, Width: 6cm The kiln and type of ware are unknown, but the markings are 實 春 菶 秋 and a stamp that reads "三嶋正印" (Mishima Sei-in). Does anyone know more about this? Please refrain from purchasing if you are not familiar with vintage or antique items, or if you are overly sensitive to imperfections.