I thought this was a Vest Pocket Kodak when I bought it, but it's actually a Kodak Jiffy 620, which is very similar in look, but it's a lot larger. If you ever saw (or see) the movie Road to Perdition, I think this is the camera that Jude Law is loading during the scene at the diner. The body is a clamshell that holds the film, and the front of the camera is a spring-loaded plate that pops open when you need it. Unlike most folders, there is no protective covering for the lens. It's a good kid's camera, since it's very simple and it's built to take a beating. Unfortunately it takes 620 film, which is discontinued, though you can shoe-horn a roll of 120 into it at gunpoint.
I can't remember how or where I got this thing. It just seems to have appeared. So either it's enchanted (and if it is, I haven't figure out how or why), or maybe I bought it as part of a box of camera junk at a swapmeet somewhere.
Camera manual: Orphan Cameras.com