The kabuto is unusual in that it has large standing rivets similar to an igabachi kabuto (kabuto with long spike rivets). It is also unusual in that it has wakidate (side helmet crests) that are made out of whale baleen.
So-fukurin kabuto Early Edo Period (1615-1867) Samurai helmet 62 plates helmet. The high suji are covered with gilt copper. Extremely good tehen no kanamono in six stages. Maedate original from Edo period.