WOW, Rare Late 1860s Daguerreotype! Davis Art Gallery ID'd Man & Woman Montana? the shining I have seen very few

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WOW, Rare Late 1860s Daguerreotype! Davis Art Gallery ID'd Man & Woman Montana? the shining I have seen very few6th plate daguerreotype of an older couple, with a note inside saying it was taken at Davis' Art Gallery on July 20th 1868! That's very late for a daguerreotype, almost stretching into the 1870s. There must have been only a small handful of daguerreotype photographers at that time I can't personally recall seeing a later dag than this that wasn't from the "revival" period. It is additionally signed "F. A. Adams", which might be the man in the photo or