Cute little thing.
There are a fair few of these kicking around, marked 0900, and they are usually claimed to be from the 1950s and definitely South American. They’re often attributed to Colombia (but none definitely proven to be so) although Colombia is not the only South American country to have used 0900 as a silver mark. I would be sure it
is silver, and to .900 fineness.
They’re usually said to be representations of Inca/Maya/Aztec gods but with no particular credence for that attribution. One seller claimed his to be a representation of the ‘Inca Corn God’, but in fact the Inca deity of corn was a goddess (Saramama, or ‘Mother Corn’).
Personally, I think Colombia is a highly likely origin and that the representations are inspired by Inca deities, but not of particular gods or goddesses… which usually have things in their hands related to their mythology.
In modern times they’re often represented holding a rough (non-gem quality) emerald, which is a modern embellishment, not traditional imagery. Lots of variations on the theme too, like these:
