This Luxus-Kunstdruck No. 502 postcard was not mailed conventionally, but on the back it has three identical stamps:  (A) upper left, stamp with 1933 Kunstlerhaus Wien” postmark; (B) upper middle, another of the same stamp with full but hard to read circular postmark; and (C) upper right, that stamp has a larger Kongresshaus Wien postmark.  It’s almost as though a visitor bought the card and then made their way through the compound and had stamps and postmarks affixed as they went along.  But we can’t guarantee that.  Grade: 3