Some of the problems with dating stereoviews are that the images were sometimes released multiple times over years (even decades if the subject was important). That sometimes makes the nature of the cardstock the best indicator. Is it curved/flat, thick/think paper? That can sometimes help identify the release date. Based on how it looks I think your guess in the 1870's is most likely moving into a bit later in that decade or 1880's if the stock starts to curve. The image might be a bit earlier in my opinion.
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