Check the listing for details. PINKERTON DETECTIVE AGENCY BUTTON NO BACK VICTORIAN ERA. Condition: Used. Listed at 32.95 USD. The Pinkerton Detective Agency Button from the Victorian era is a collectible piece that represents a significant historical organization. This button, with no back, would have been worn on clothing by members of the Pinkerton Detective Agency during the early 1900s. As a symbol of the police organization, this button serves as a tangible piece of history from a bygone era, making it a valuable and sought-after item for collectors interested in police memorabilia and Victorian-era artifacts.The Pinkerton Detective Agency Button from the Victorian era is a collectible piece that represents a significant historical organization. This button, with no back, would have been worn on clothing by members of the Pinkerton Detective Agency during the early 1900s. As a symbol of the police organization, this button serves as a tangible piece of history from a bygone era, making it a valuable and sought-after item for collectors interested in police memorabilia and Victorian-era artifacts.