A beautiful example of an iron, open work, sword guard (hushou) made in Tibet for the Japanese market. The open work is easily identifiable as Tibetan, being typical for the work from Tibet. The design elements, such as the style of the dragons and the beaded rim, point to the Qianlong period (r. 1735-1796) when these elements were popular. The pearl at the top of the guard, between the two dragons floats free.
I find this piece particularly interesting as a very strong indicator of a trade in fittings between the early Qing empire and Japan as craftsmen working in far away Tibet obviously had a clear idea of what was expected in a guard meant to be mounted on a Japanese katana. Note the two holes on each side of the guard for the small knives carried on each side of katana scabbards as well as the blade edge up washer seat.