This irregular disk with smooth radial fluting is a fine example of a type of carved stone object found in the keyhole-shaped burial mounds of central Japan from the fourth and fifth centuries. Works in this shape are called sharinseki (carriage-wheel stones) and are sometimes identified as stone bracelets. They seem, however, to be talismans with magical or religious significance. They do not appear in burials of the later Kofun period; perhaps their special meaning faded with the influx of Chinese and subsequently Buddhist culture that began in the sixth century.

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