The Aztec’s sure had a handle on things from agriculture, to building famous pyramids and their great invention of the Aztec Calendar! It was carved on stone using solidified lava, but boy the world has come a long way. Now you can hold this iconic calendar on a 1 oz. .999 fine silver round. If we’re one in the same, then you know this prominent emblem is a valuable piece that will only thrive as the days go by.