The Instamatic camera 50 was manufactured in Great Britain between 1963 and 1966.
This 126 format (28*28 mm) model is a more basic version of the Instamatic 100 (without adjustment possibilities) and has 2 speed options: 1/40 and 1/90 seconds. The 43 mm focal length lens has a fixed aperture of f/11. You also have the possibility to add a flash on the top cover.
Where to find it and at what price ?
This type of device is very common. You can find it at garage sales or flea markets. It costs about 5€ if it is in good condition. It cost 49.50 francs at the time it came out.