machoncotl = a bracelet of feathers
James Lockhart, The Nahuas after the Conquest: A Social and Cultural History of the Indians of Central Mexico, Sixteenth Through Eighteenth Centuries (Stanford: Stanford University Press, 1992), 200.
machoncotl = arm bands with quetzal feathers
James Lockhart, We People Here: Nahuatl Accounts of the Conquest of Mexico, Repertorium Columbianum v. 1 (Los Angeles: UCLA Center for Medieval and Renaissance Studies, 1993), 124.
machoncotl = the shell bracelet which the king wore on his upper arm
Mexican and Central American Antiquities, Calendar Systems, and History: Twenty-Four Papers, eds. Charles Pickering Bowditch, Eduard Seler (1904), 63.
machoncotl = upper-arm bangle
Codex Vaticanus No. 3773 (Codex Vaticanus B): An Old Mexican Pictorial Manuscript in the Vatican Library, eds. Eduard Seler and Joseph Florimond Loubat (1903), 116.
machoncotl = "the upper arms are decked with the rings extended like a shield on one side"
Codex Fejérváry-Mayer: An Old Mexican Picture Manuscript in the Liverpool Free Public Museums, eds. and transl. Eduard Seler and Augustus Henry Keane (1902), 206.