Regardez par transparence

 Regardez par transparence or a "Hold to light" postcard. Hold to light postcards were popular novelty cards during the late 19th - early 20th century. This series has drawn "statues" of famous performers and when the card is held to the light, a photographic image can be seen. Famous beauties include Caroline Otero, Lina Cavalieri, Liane de Vries and others. The photographic image is by Reutlinger circa 1899.