Another shot from Mérida’s Museum of Anthropology and History, in Yucatán, Mexico:
This item’s identified at the museum as “The disk of Chichén Itzá,” although I can’t find any mention of it online. Here’s what the placard next to it had to say:
Relief on a round block of stone where one can see two scenes: the lower one is probably related to the netherworld and the upper one, which features birds, to heaven. It was found at the astronomical observatory of Chichén Itzá, known as “El Caracol” (the Snail).
On the rounded part of the stone [around the disk’s edge] there are 24 glyphs, of which 8 represent Ahau, the title given to the highest-ranking personages.
Late Classic – Early Post Classic (900 – 1200 AD).