This helmet was owned by the 7th lord of the Yanagawa domain, Tachibana Akinao.
It has a unique design showing another type of headwear mounted on the helmet. The headwear resembles eboshi, a traditional formal cap, but it also has a cloth-like wavy brim. The headband with flipped-up ends is formed like ‘kuwagata’, a helmet crest in the shape of stylized horns.