Helmet representing the flaming jewel (hōju-nari kaen kabuto)
By Unkai Mitsuhisa
Early Edo period, c. 1630
Iron, lacquer, lacing
19 ½ x 16 x 16 in. (49.53 x 40.64 x 40.64 cm)
6 lb. (2.72 kg)

Unkai Mitsuhisa, a renowned master armorer, founded a school in the seventeenth century in Kaga province (modern-day Ishikawa prefecture). His pieces demonstrate his exquisite ironwork and are defined by their aesthetics and the delicate finish of their patina. A true masterpiece, this six-plate iron helmet takes the shape of the cintamani, the flaming, wish-fulfilling jewel of Buddhist doctrine. Each flange (suji) is cut in the shape of flickering flames that join at the crown to create a larger flame. The frontal ornament is the stylized heart of Marishiten, goddess of archers.

http://samurai.kimbellart.org/exhibit/the-evolution-of-helmets/saint-francis-ecstasy-0