In 132ad China during the Han Dynasty a man named Zhang Heng invented the seismograph. A device to show when an earthquake took place and how intense it was. A mild one dropped one or two bronze balls from the dragon's mouth to the frog's mouth. A real bad one released more. Very smart people.
This is a remake of the original and sells for around $4000.00.
Has gold balls. Very nice idem. If you see one, now you know what it is.
A original Bronze one would be priceless, keep an eye out for it.
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