Hi Jon. I can't give a definitive answer to that, but I can provide an educated guess based on my research. Albumen photography started becoming more widespread about 1855. Also in 1855, Walter Avery, who had moved to California, realized that he wasn't going to strike it rich in the Gold Rush and moved back to New York and rejoined the Knickerbockers. So somewhere around there would be a reasonable guess, and would not eliminate the possibility that it went directly to a stereoview, especially if Anthony took it. But I also know that even older pictures were made into stereoviews years (or decades) after they were taken. I suppose I should do some reading up on anatomy to see how long it would take Avery and Birney to go bald based on their degree of hair loss and attempts at a comb-over.
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