These coins are cast in metal, copied directly from an original prop, and gold plated to give them the feel and look of a real gold coin. On the front side of the coin is a skull surrounded by an Aztec calender design, while the back shows two pictorgraphs.
Although according to the film, all 882 Aztec coins were identical, two versions were shown in the film. One had the pictograph backing as shown above, while another version showed the same skull design on both sides. This alternate version (shown on the top of the picture to the right) has the same overall thickness.