These Jacques Biederer real photo postcards are blank on the back and slightly vary in size from one to the other. There are traces of album scrapbook on the backs. These were highly collectible back in the days, as they are today.
In the following 4 postcards I found online she’s wearing the same thigh high stockings and shoes, and he the same suit and tie:
Apparently these two were a favorite of the photographer. I found them in several series.
Something that took me aback and kind of bothers me…a lot. These postcards go for a mint, however I’m amazed there isn’t a regular Wikipedia entry for this talented photographer (and his brother). It’s a sad fact and should be fixed!