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E. & H.T. Anthony & Co.
Solar enlargers in use
Private collection of Doug York
Although this stereocard has not details the same photograph was taken by E. & H.T. Anthony & Co. and published as "Anthony's Instantaneous Views, No. 7160"
The dating is based on when "Anthony's Instantaneous views" were heavily advertised in papers in 1859-1862. I'm indebted to Rebecca Stearns for this information (20 February 2018).