Linda Schele and David Freidel presents a figure of a monument at Chichen Itza that depicts a curved weapon.
Linda Schele and David Freidel, A Forest of Kings: The Untold Story of the Ancient Maya (New York: Quill, 1990), 393
[Figure of a monument at Chichen Itza that depicts a curved weapon c. 874 AD]
Commenting on curved swords in Mesoamerica, Matthew Roper wrote
Despite Hassig’s belief in the late invention of this weapon in Mesoamerican history, evidence from earlier Mesoamerican art shows that it was known far earlier than he realized. A stela from Comitan, Chiapas, from before A.D. 1,000, portrays a curved object like this weapon, while something similar is depicted on a monument at Chichen Itza, dated, according to its inscription, to A.D. 874. (Matthew Roper, "Swords and 'Cimeters' in the Book of Mormon," Journal of Book of Mormon Studies 8, no. 1 [1999]: 42-43)