Probably saw 50 different pictures of him online. Just the labeling on the photo means these had muliple copies that where used for advertising and sale.
From a NYT article on PTBarnum:
“For almost two decades Barnum advertised chiefly through written ads, color lithographs and banners that could exaggerate the features of his exhibits. But by the 1860's, the invention of mass-produced "carte-de-visite" photographs offered a new product for him to sell. And so, one by one or in groups, Barnum's "curiosities" made their way to the photography studio of Mathew B. Brady, whose business had prospered partly from Barnum's patronage. thousands of finished pictures were available for 25 cents apiece.“
Past sales records from eBay of Admiral Dot Photos run from $15 to $80 .