While the American Civil War is a U.S. event, many international collectors catalog Civil War-themed stamps using these shorthand notations.
It might refer to the 10th Cavalry or 10th Infantry , with "8d" being a specific platoon or squad notation used in modern historical gaming or reenactment databases. 10 Civil War - 8d
Could represent Box 10 or Folder 10 in a specific collection. Civil War: The primary subject matter of the contents. While the American Civil War is a U