As the soul of the samurai, the sword is famously both the symbol and instrument of Japanese military prowess. Less known, at least in the west, is its role as a fashion accessory or status symbol. More than the weapon itself, it was the sword's metal fittings--from the hand guard to the small decorative plates on the hilt--that reflected the complexities of samurai life. Some fittings were meant to convey the honor and self-control expected of a...