Diameter should be around 35mm. The thickness would be about the size of two stacked coins. The Mayan calendar piece thickness would about 1/8" and raised above the lower level sun rays.
Original Design Mock-up
Black and white versions I've tried using here (I have one model based on the last image below)
Alternative approach (no Mayan 3D print, I would secure a mayan calendar coin to inset into the piece)
Material (metals)
Ideally this would be two tone - the sun rays silver, the Mayan calendar gold, and the rim between the two bronze.
Let me know if you would like more info or another image. Thanks!]]>