Albumen stereoviews first showed up in the mid-late 1850s, I believe. Frederick Langenheim of Philadelphia made the first stereoviews on glass circa 1854.
Shortly thereafter, he began making albumen stereoviews. I have a few non-baseball Langenheim 1850s albumen stereoviews with the curved top photograph style. Their date is confirmed by their reverse "American Steroscopic Company Langnheim and LLoyd" identifier. Langenheim and Lloyd were partners in the American Stereoscopic company from circa 1857 until 1859, thus the positive late 1850s dating. Although in the photography business for years, the Anthony brothers didn't start making stereoviews until 1859. This means the "Knickerbockers" stereoview can be as early as 1859 per my Langenhein Lloyd stereoviews of a similar style. I can not speak to the identification of the men in the stereoview, but the stereoview can be circa 1860. Seeing the reverse of the stereoview might also help with determining its age.
I will also add that if the stereoview in question is a larger "imperial" size stereoview, it would almost certainly be post 1870.
Last edited by GaryPassamonte; 09-04-2021 at 04:19 AM.
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