Han dynasty square stone seal unearthed at Kau Sai Chau, Sai Kung, is the only Han dynasty seal discovered in Hong Kong to date. (Collection of the AMO)

Han dynasty square stone seal unearthed at Kau Sai Chau, Sai Kung, is the only Han dynasty seal discovered in Hong Kong to date. (Collection of the AMO)

Han dynasty square stone seal unearthed at Kau Sai Chau, Sai Kung, is the only Han dynasty seal discovered in Hong Kong to date. (Collection of the AMO)