The object in the image is a Japanese antique kawara (roof tile) featuring an ivy (lotus) crest (tsuta-mon) design. Kawara are traditional Japanese roof tiles, often made of clay and used on temples and traditional houses. This specific kawara is a round, fumed silver clay tile with a carved ivy (lotus) pattern. It is considered an antique. 4" diameter. One end is higher than the other (see photo)
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