Approx. date of manufacture: 1948
Approx. original price: $unknown
The proper name is Ciné-Kodak Magazine 8, but I've been putting Kodak first to group them logically.
The National Media Museum in Britain says that this was introduced in 1946 and ran until 1955. According to them, it was the Model 90, but they they quickly dropped that designation, so if you find a 90, you might want to grab it. It may be a collector's item (but don't quote me on that.)
This is a close match with my Ciné 8 Model 20; the major differences are that this takes a magazine, whereas the Model 20 takes spools, and this one has a little knob on the right side (just in front of the trigger) to alter the film speed. This one can take at 16, 24, 32 and 64 frames-per-second. You can really burn film at 64 fps!
A mostly cosmetic difference is that the Model 20's viewfinder was in the hinges of the carrying handle—clever but probably a pain-in-the-ass when it flipped down at the wrong times. This one has a long bomb-site viewfinder, and the carrying handle attaches to the top of that.
Both cameras have detachable lenses. I don't know if they're compatible. I'm afraid to take this one off as I might break something in the process.
Kodak's website has a nice piece on the history of Kodak movie cameras.
As always, there's a YouTube video (his is much nicer than mine).