By the way:
Why would anybody put something like "Macungie Township, Lehigh County" on their house sign? This information, I would think, is something that one would put on an item--a rifle, a letter, whatever--that travels away from one's homestead.
Certainly if the sign is of more recent vintage--perhaps to honor Rupp at his homestead at some point--nobody would use DP for Township, unless they were copying an earlier sign that hung there. So maybe it means something else ... though what?
The sign predates the Bicentennial, since Sam Dyke removed it from the home in 1967.