This Japanese tea bowl (chawan) exemplifies the restrained yet expressive aesthetics of post-war Japanese studio ceramics. The vessel features a deep, iron-rich black glaze with subtle granular texture and kiln-born variations, creating a quiet but powerful surface that responds beautifully to light. The form is compact and well balanced, with a gently flared rim and a solid, carefully finished foot. The interior shows natural spiral throwing marks, emphasizing its hand-formed origin. The glaze pools and transitions are consistent with high-temperature firing, likely in a reduction atmosphere, lending the piece both visual depth and tactile presence. The base bears a clearly impressed potter’s seal, indicating authorship rather than workshop production. This is further supported by the original signed wooden storage box (tomobako), inscribed in sumi ink and stamped with a red seal, a traditional practice used to identify the work and its maker. The set also includes accompanying original papers/booklet, strengthening the provenance and collectible value. Stylistically and materially, the piece aligns with Japanese tea ceramics from the Shōwa period (mid-20th century), a time when many kiln masters explored traditional tea forms through modern sensibilities. While rooted in the tea ceremony tradition, this bowl also stands as an independent sculptural object. A refined and authentic example suitable for use, display, or collection, especially appealing to collectors of Japanese tea wares and studio ceramics.