This is a Carte de Visite (CDV), which is French for "visiting card." These small photo cards were commonly traded and collected by people in the 19th century; most popular in the 1860s.
Photographed by Heney & Thompson, Succesors to R. Weston, 132 Chatham Street, New York.
Standard-size CDV, measuring about 2.5 x 4 inches.
Will be shipped safely and securely! All items are protected in archival sleeves and packaged in rigid cardstock.