image by Jaap Schelvis (Image rights)
The Revuematic 50 is a very basic camera for 126 film distributed by Foto-Quelle in Germany in 1966.
It appears to be a rebranded Halina Speedoflash manufactured in Hong Kong by Haking.
It has a single shutter speed, no aperture control and a fixed focus lens.
What appears to be the window of a light meter is in fact just a print and the two AAA-batteries are only used to fire the flashcube.