This kabuto has 34 plates. It is extremely rare to find a kabuto with this number of plates. In my research in the kanto, I have found that many of the early pieces dating to earlier periods did in fact have an unusual number of plates, perhaps to make it something that nobody else had.
Ko-boshi bachi of the highest quality: the 1,550 rivets that keep together the 62 heavy plates are of decreasing size and have been fixed with amazing geometrical regularity. The bachi is signed by Saotome Ietada, founder of the Saotome school, considered to be the best kabuto maker of the entire Edo period. The interior of the neck protection (shikoro) is lacquered in gold, a typical feature of the Kaga region to indicate the high rank of the samurai who was wearing it.
62 plate hoshi kabuto, by Joshu (No) Ju Saotome Iechika, Edo period, 17th to 18th c, with concisely spaced suji [ridges], each plate with a row of thirty three small rivets, the iron mabisashi [peak] lacquered with gold mura nashiji depicting flying plovers in gold hiramaki-e, a rare double shikoro [neck guard] formed of an upper section with four bands of brown-lacquered iron, the lower band with a shakudo fukurin [edging], the top two bands turned back forming the fukigaeshi [turnbacks].