Backmarks
You will often find photographer advertisements on the backs of images. From simple to elaborate they can be extremely helpful when it comes to researching an image.
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VERSO: Portrait of an Unknown Woman (CDV) - Bates Album
Backmark: A. McIntosh. 4 1/4 x 2 1/2 inches Carte de Visite from page 18 of the Bates Album.
