It looks like a 3A. There are many different models of that particular camera, some made in Britain and some in the states. I have one with a Zeiss Tessar on a Koilos shutter that has a separate plate back and holders as well as the roll back. The lenses are good cheap ways to break into 4 x 5. Assume the shutter is firing at about 1/25 and go for it. That's what my old beat up shutters seem to settle at when they don't adjust anymore. if the bellows were serviceable you might put in a mask and set the thing up for 120. You can get 6 x 12 images on roll film with some care.