From what I understand, he would toss out cards like this into his audiences.
In late January, early February, 1980 as part of a publicity stunt for an upcoming attraction, we held a seance on the mezzanine of the RKO Palace in Columbus Ohio with Harry Blackstone. One of Blackstone's cast attempted to contact Thurston, it was rather comical, and was taped for a local access TV show. Of course nothing more then a bunch of moaning and drama occurred.
Three months later, in May 1980 a group of us were sent to the Fox Theatre in Philadelphia to salvage light fixtures before the Fox was razed. When I climbed above the ceiling of the auditorium to lower the big chandelier in the dome, I found this card laying in the dust.
The other side of the card, with Thurston's daughter Jane.
The Philadelphia Fox, where Thurston began his farewell tour, August 23, 1935. I found the card mentioned here above the main ceiling on my way to lower the big chandelier in the dome as seen here. From Exhibitor's Trade Review, December 15, 1923.