Tea bowl. Kuro(Black) Raku ware known as "Kamiya-guro". Momoyama period, 16th century.
RAKU BLACK BOWL 'RAW-KAZAORE'
According to the history of tea development in Japan, Raku pottery was the collaboration between the Japanese Tea Master Sen Rikyu (1522-1591) and the Korean potter Chojiro (1516-1592). Chōjirō produced bowls for Chanoyu, the Japanese tea ceremony at Sen Rikyu's request. These tea bowls were made of soft pottery and featured un-embellished, rustic black or dark red /black glazes. For his contributions, Chôjirô was given the family name Raku.
This raku tea bowl have a rim that is proof of old age. My knowledge can't help to find addictional informations.