The bottom line looks a bit like a snake, and the Mexicans sometimes depict their Eagle as having feathers that stand up from its head (unlike the American bald eagle).

https://www.google.com/search?q=mexican+animal+poker+chips+eagle+snake+mother-of-pearl&tbm=isch&source=iu&ictx=1&fir=QJcmq7DuVOqDOM%252CdSPO-FYU584LAM%252C_&vet=1&usg=AI4_-kTPBpLXHUQQ69kNzPzNypKdmUdkaw&sa=X&ved=2ahUKEwjC2dPK8Z7rAhXMG80KHVuNBvIQ9QEwAXoECAoQBw&biw=1280&bih=913#imgrc=QJcmq7DuVOqDOM

What we call an "eagle" may more accurately be the Northern Crested Caracara, a type of Falcon, which definitely has a crest of feathers on its head:

https://en.wikipedia.org/wiki/Northern_crested_caracara