The round iron plate is pierced on either side of the central opening with large, fan-shaped apertures. The surface has some hammer marks and the edge has many fine iron bones--height and width 7.7cm., thickness 4.0mm.
Lot Essay
This design became popular with various Higo schools in the early Edo period and was used until the Meiji era (circa 1600-1870).
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Japanese Swords & Sword Fittings from col Dr Walter Ames