"Positive Glass Plate, Stereoscopic Nude C.1925 Photograph"
Stereoscopic glass plate, 6 x 13 cm. Seated nude woman. Stereoscopy is a technique that recreates the impression of three-dimensional vision (3D) from two 2D images. Link to the website:
https://www.lavalisearlesienne.com/product-page/plaque-de-verre-positive-nu-st%C3%A9r%C3%A9oscopique-ref101-c-1925