matlactli (T1871:1)
This element for the notation representing ten (matlactli) was part of a compound sign for a measurement in arm lengths (matl). The notation consists of ten small circles representing ones, all in a horizontal row. The circles appear to be colored, but the colors are difficult to decipher and may not be intentional.
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Unlike some other ones, these do not have smaller concentric circles or dots inside them. Also unlike some other groups of ten ones, these are not separated into two groups of five. See below, for an example of that. That "see also field" (below) also includes another row of ten ones from the same manuscript but with slightly different coloring.
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by 1553 by the latest
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números, círculos
matlactli, ten, https://nahuatl.wired-humanities.org/content/matlactli
diez
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Single-page codex, Archivo General de la Nación, México, Ramo de Tierras, vol. 1871, exp. 1, fol. 28r.
The Archivo General de la Nación (AGN), México, holds the original manuscript. This image is published here under a Creative Commons license, asking that you cite the AGN and this Visual Lexicon of Aztec Hieroglyphs.