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A painted ceramic vessel in the Codex Style. It depicts a wayob', the companion spirit of a Mayan ruler. This one is a toad which is wearing a jade bead necklace (there are two different animals, not visible, located around the back of the cup). There is also writing in Mayan glyphs, some of which declare the vessels purpose: drinking cacao.
The painter is also known by style from other pieces of work, and in the absence of an actual name is referred to as "The Metropolitan Master". You can see the original image and some other details here.
(Originally posted to Reddit by me in 2023)
Oh, wow, that's fantastic! Great find, I have a friend who'll love seeing this!