solstice sundial, Four horn penannular ring, Neolithic period, mongolian Culture, 四突玉玦, 東亞型玉器, 6.3cm (click to view details)

 solstice sundial, Four horn penannular ring, Neolithic period, mongolian Culture, 四突玉玦, 東亞型玉器, 6.3cm (click to view details)

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