Not sure I am reading the picture correctly, but I think it says Eastern Star Home.
I zoomed in and cropped the sign.
From what I researched, if the text is accurate, it is the meeting place for the Order of the Eastern Star (related to the Masons) https://en.wikipedia.org/wiki/Order...Eastern_Star
And one of the members couldn't make it to the meeting so sent a postcard to Sister Mary?
Where did the word "Defender" come from below the stamp? Part of the postcard?
Anybody familiar with Philadelphia and 3333 Chestnut St? It's a parking garage now, but used to be a historic street of some sort.