It is a white cardboard with bevelled edges placed between the frame and the photograph. The mat has a double function:
Scene from the movie Cafe Europa. In the "Cafe Europa", Schroeder (Jacques Breuer) and Yobo (August Zirner) come unexpectedly to the biggest catch of their professional careers.See all photos from Imago Images
Imago Images - United Archives
Your photograph is printed on a high quality satin photo paper in 250g thickness. Thanks to our high-performance printing systems and a sharpness of up to 1440 dpi, we guarantee you a product worthy of the greatest art galleries. If, despite our expertise and precautions, you notice something wrong with your product, we will send you a new photograph at our expense.
kbdig, 1900, t.s., Cafe, Europe