This 4-color "hard enamel" pin is 1" x .5" (25mm x 13mm) and has one post with a rubber clutch. The design is based on the glyph for the 15th day of the Tonalli (day signs) of the Aztec calendar.

These 20 day symbols feature animals, plants, and aspects of nature that the Aztec used as a type of personal astrology and to carefully track the passage of days through a 260-day religious calendar.