The Canon 814 super-8mm camera was developed as a high-end camera for the Super 8 market. At first, Canon planned a 6x zoom lens to be fitted onto this model. The company had to take a lot of technological hurdles.
The Auto Zoom 814 Super 8 was introduced in 1967 and had the world's first 8x f/1.4 zoom lens.
814XL-S manual: Download here the Canon 814XL-S manual (PDF, 7 mb.)
What's it worth? Take a look at this list of: sold Canon 814 for a value indication.