A group of items related to stereo photography (I). The group with a late 19th / early 20th century 'Perfecscope' stereo viewer, a set of 22 Keystone View Company stereo cards, a further set of cards, a boxed 1950's viewer with slides, a small metal French viewer labelled 'Imperial Npg', some unrelated slides and a book 'New York city in 3D' with inbuilt viewer. (7 items)