I believe this was once an ad for Dr. Tutt's Liver Pills. Why Dr. Tutt's? Because "constipation is a crime against nature . . . Dr. Tutt's Liver Pills is the remedy . . . Get a box and see how it feels to have your liver and bowels resume their health-giving natural functions."
Waypoint tracking, similar to geocaches, call these ghost signs.
I wonder if they were more effective than Carter’s
[…] UPDATE: According to Matt Green of I’m Just Walkin’ and Commenters, this was once an ad for Dr. Tutt’s Liver Pills. […]