A place for show-and-tell, wondering aloud, and wandering the trails of curiosity . . . Comments, corrrections, additional information, fresh insights, other interpretations, more images, or related observations will be welcomed!
This is an example of a backmark design with an included empty spot for the placement of a U.S. First Issue revenue stamp.
In this case, the allocated spot was not quite large enough, so the applied stamp somewhat overplaps the design.