Stereoscope by Lechner & Muller , Vienna.
Hand-Held or Table-Top Stereo Viewer by Lechner & Muller , Vienna.
The viewer is put together with a stand and a wooden base. Dismantled, the base slides over the eye-pieces to protect them. The stand fits inside the base. Hinged mirror for viewing cards, interocular adjustment, nicely made in polished light walnut.
Stéréoscope Lechner & Muller