Statistics for occurrence #1 of “Carte de Visete” in chapter 1 of Isaac O. Best, History of the 121st New York State Infantry:

...mrades that photography during our service was just emerging from the daguerreotype, and the tintype, into photographic prints on paper, and that practically all photos made in those days were of the Carte de Visete size (2 1/8 x3 5/8 inches). Hence the necessity for the diminished size of most of our illustrations. It was found to be impossible to secure any considerable number of photos of the line office...
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