Fake Post Office?
Sinking Springs, PA
This historical account says-
The area is now mostly residential, but until 1931 it had its own post office and it was the site of the Montello Clay and Brick Co.
https://www.readingeagle.com/news/history/united-states-of-berks-get-to-know-spring-township-history-and-how-it-got-its/article_41ef877c-752d-11ea-aa80-afd9a6f48a27.html
But here it is on Google Maps, with lots of reviews that have only 2 viewpoints.
Either they love the place and the "blonde lady" (always in quotes), or they couldn't get service, treated like they were dumb, called and the phone just rings.
4100 W Penn Ave, Reading, PA 19608
(800) 275-8777
https://maps(dot)app(dot)goo(dot)gl/DodNnFmuzw2X7s6t7