A Japanese helmet bowl hoshi-bachi
A Japanese helmet bowl hoshi-bachi of koshozan ('high victory mountain') form 16th Century, mumei. Formed from 62 plates each secured by 30 pointed rivet heads (muku boshi) and graduated in size. The small hole in the crown is lined with elaborate mounts (tehen no kanemono) in soft metals. An iron socket (ushiro-date) is fitted to the back of the brim (koshimaki), and a single iron lame of the shikoro is secured by 4 gilt rivets. The bowl is black lacquered inside and out, and red lacquered beneath the peak, the inner surface of the brim is not lacquered. The bowl is earlier than the brim, peak and shikoro, and the lacquer on these parts is incomplete. The helmet has good age patina overall and has not been cleaned.
Weight 2lbs 9¼ozs (1.17kgs)
for further details see "The Manufacture of Armour and Helmets in 16th Century Japan" by Sakakibara Kozan, edited H. Russell Robinson, Holland Press, 1962