Muromachi (1333-1573) or Momoyama (1573-1615) period, late 16th century The russet-iron bowl constructed of 30 plates riveted together forming a tall bowl swelling slightly at the rear, each plate with 15 standing ball-shaped rivets diminishing in size as they approach the crown, and framed by chrysanthemum-head washers, the bowl adorned with gilt-copper fukurin running around the koshimaki and joining as a four-stage tehen kanamono carved with foliate scroll, the mabizashi trimmed with a gilt-copper fukurin, the maedate formed as a long-horned demon finished in gold, silver, red, and black lacquer, applied with a tuft of yak hair, the helmet finished with gold-lacquer wakidate formed as young bracken fern, the bowl fitted with an Edo-period five-lame solid shikoro lacquered black and laced in dark blue, with additional laces on the lowest lame to secure the shikoro during storage, the fukigaeshi decorated with heraldic crests in gold hiramaki-e 6 1/4in (15.9cm) high, the helmet bowl only