I've extended my collection with an interesting set of 50 glass 45x107 stereoviews and a simple stereoscope. The stereoviews are published by the Service des Ventes de l'U.N.C. (SDV).
I’m collecting glass stereoviews since 2018. It started with the purchase of individual slides with images of the Battle of Verdun. My collection started to grow with the acquisition of a lot with 144 stereoviews in 6x13 format. All slides are from the same manufacturer: La Stéréoscopie Universelle, abbreviated LSU.