This is an antique cabinet card photograph of man.
These are larger (about 4¼ by 6½ inches) than the Carte de visite, which were popular about the same time. About 1860, both were used and they began making cabinet cards out of an albumen print, a thin paper photograph mounted on a thicker paper card. Later other papers began being used.
The albumen print process had a sepia tone and were made from the 1860's to around 1890 when the black and white or neutral tones and were most likely produced on a matte collodion, gelatin or gelatin bromide paper.
A true black and white was most likely produced after 1890 or after 1900. The last cabinet cards were produced as late as 1924.
The back on this cabinet card is blank. The front has the name of the studio. Taken in Welch Block Manchester PA.