China 1992 Inventions and Discoveries of China Series - First Seismograph 22 grams Silver Coin - NGC PF-69 Ultra Cameo
Part of Inventions and Discoveries Series. Commemorates the first seismograph (earthquake detector). This gem proof coin is minted from 22 grams of pure (900 fine) silver. Rare opportunity to acquire this coin, which is usually available only as part of an expensive set.