45 x 107 mm plates.

This was sold as an accessory for the Stereolette camera - a metal folding plate camera. It was advertised as the Primus Transparency Printing Frame, also made for 6 ¾" x 3 ¼" plates (though not called the Stereolette).

Construction:

1) For 6 x 13 cm plates. Removable pressure plate.
2) 3 ¼" x 6 ½" plates, made of walnut.
3) 3 ½" x 5 ½" plates, made of mahogany, removable pressure plate. Similar models made by Chadwick, (PA 1891, p. 552).

6 ½" x 3 ¼". Later sold as the Stereo Kodak Printing Frame.