The earthen vessels excavated at Sasayama Archaeological Site (in Niigata Prefecture) and owned by Tokamachi City: 57 pieces of earthen vessel, including what is called "kaen-gata doki" (the flame-shaped earthen vessel), were designated as national treasures.
笹山遺跡（新潟県）出土品（十日町市所有）－いわゆる火焔形土器など57点が国宝に指定。