1890-Do MC NGC AU 55 Mexico 8 Reales Durango Mint Silver Coin (23012103C)Almost Uncirculated Mexico silver 8 reales coin. Struck at the Durango Mint (mint mark Do), assayer MC. Dunnigan Do 79: Although common in circulated condition, this coin is very scarce in Almost Uncirculated and Uncirculated specimens are very rare. Certified by NGC AU 55, Population Census: This coin, only 7 higher. Defined Cap, rays and eagle feathers. Light golden tone with underlying luster.