Kodak No.2 Folding Autographic Brownie
The Kodak No.2 Folding Autographic Brownie was made from 1915-1926, and this one's pre-1919, so we're talking about a camera that's at least a hundred years old at this point. Even better, it works: the shutter fires happily at 1/50s (slightly less happily at 1/25) and the bellows are light-tight. Best news of all: this shoots standard 120 film. Just regular stuff you can buy off the shelf right now. It's a hundred years old. That's legit.