Voigtländer is an optical company founded by Johann Christoph Voigtländer in Vienna in 1756 and thus the oldest name in cameras. (Wikipedia)
This post-War accessory range finder is one of the nicest items in my collection of old cameras. My need for reading glasses for any close work makes its use impractical for me as I end up fumbling around between glasses, camera and range finder while trying to catch the moment.
The model may be viewed or downloaded at the Google 3D Warehouse.