Vintage 50s/60s halina viewer no.531 with box this great looking vintage viewer is in great condition (not tested but see no reason for not working requires batteries) rare with box etc personally I would just have it as a great decorative piece great present for a photographer etc some age related wear 14 cm wide 12 cm width 11 cm tall box dimensions 
The Halina slide viewer was a popular accessory in the 1950s and 1960s, when 35mm color slide photography became more popular. The Halina slide viewer was a hand-held device with a magnifying lens and battery-powered light
slide viewer is usually a small handheld device with a slot in which a slide can be inserted to see a magnified illuminated view of it. A slide viewer is an instrument for individual viewing. Some models have an automatic feeder for inserting multiple slides and some have a slot for a strip of film. The slide viewer may rely upon natural light or incorporate a light source.