Saika kabuto, Muromachi-Momoyama period , armor produced by the smiths from the area of Saika in Kii province were distinctive in that they featured a set of prominent chrysanthemum rings set around the tehen, strong standing rivets and embossed eyebrows. http://www.jujitsumelbourne.com.au/-jiu-jitsu-brunswick-melbourne-vic.html
The original of the kabuto (helmet) of the Dragon Armour is interesting inasmuch as the bowl of the helmet came from the Momoyama period. The suji bachi style of bowl, with overlapped and riveted plates was typical of the finest helmet makers (katchu-shi) of this period, borne out by the signature of the Saotome smith ''Ienao'' on the back plate. The menpo (mask) is a typical ressei men of the type made in Nara.