A Japanese ceramic tea bowl (chawan) featuring a deep black to dark iron-grey glaze with subtle metallic and ash-like surface variations. The form is compact and well-balanced, with concentric throwing lines visible on the interior, reflecting traditional wheel-thrown craftsmanship. The glaze displays natural kiln effects typical of Japanese high-temperature firing, with soft transitions in tone and texture that emphasize the wabi-sabi aesthetic valued in tea ceremony wares. The foot is left unglazed, showing the natural clay body and firing marks. The tea bowl is accompanied by a wooden storage box (tomobako) with handwritten Japanese calligraphy on the lid. The inscription identifies the piece as a tea bowl and serves as a traditional method of storage and presentation. While the inscription appears to be descriptive rather than a confirmed artist signature, the presence of a tomobako adds contextual and cultural value. Based on the glaze style, form, and box presentation, this piece is most likely from the Showa period