I picked up this little Kodak Baby Brownie last week. It came in a pair, with a Baby Brownie Special. I'm trying the "non-Special" first.
The great copypaste feedback loop that is the Internet suggests it's got a fixed aperture of f/11. And the shutter speed is "around" one fortieth of a second. This is the domestic model, sold between 1934 and 1941. An export model was created later, which offered a manual shutter mode. (Sold in the UK between 1948 and 52.)
It takes 127 format film, and I've just shot a roll of efke 100 on it in bright sunlight. My light meter -- given f/11 on 100 speed film -- varied between recommending 1/125 and 1/8 shutter speeds as I tried a few different lighting conditions. We'll see what comes out!