There are multiple sets of these transfers, some in portrait form. They are German-made, sold here. I believe there are 20 or 25 of them in each 'set'(1 sheet). I have some that were 'stuck' to the back of an Exhibit card but I can't find the image right now. I haven't seen the black BG before. There were all sorts of subjects from the same issuer:
I bet the parents just
loved this stuff on everything in the house...