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Is this 1879 Ho "grimacing snake" the only year and mint they used this particular design for the snake?
Without going into too much depth, 1879 predates the universal adoption by the various mints of standardized die designs. Most individual mints were still employing engravers who rendered dies to a general pattern, but with a great deal of heterogeneity in the details. Even within the production of a single date by such mints, there might be discernible varieties depending upon the artist's ability to accurately reproduce his earlier work or even on account of a midyear switch to a noticeably disparate style.
As an example of the first, more minor and subtle sort of dissimilarity that may be encountered, consider the image below of another 1879 Ho (not mine) for which the snake's mouth is opened a bit wider with upper and lower jaws of a bit more equal length, the resulting expression seeming to be (to me at least) one of surprise rather than anguish.

Now since the eagle side die isn't dated, the exact type I have could conceivably turn up on a Hermosillo struck specimen bearing a different date. You'd have to examine quite a few coins to be convinced it or something extremely similar didn't, and even then you couldn't be 100% certain. The crafting of Mexican 8 reales coins during the period was just too irregular.
Colligo ergo sum
Edited by Lucky Cuss
09/15/2017 11:47 pm