Kodak No2 Folding Pocket Brownie
This is my oldest camera thus far, dating to between February and August 1911 (thank you, George Eastman House website!). What's more - it works! My avatar is a tiny crop from a pic taken with it. The viewfinder mirror really needs replacing, but for a camera almost a century old it's in fine fettle.
(actually, I've since replaced the viewfinder mirror, and it's still cr*p!)