Nice score! Mine is like the one on the right, with room for the hatcher tray below, which is missing in that one. I can't see the thermostats on it...but it's a 1200 or 1400 series. Middle one can't see enough to tell what it is but it looks pretty empty inside. One on the left looks like a professional series (no hatcher) or a ratite incubator, maybe a 1266.
Do they smell as bad as mine did, full of rodent piss? If yours have bubble pack on the bottom, it's probably full of stink too.
If you have any trouble with them I am pretty familiar with them now. http://www.backyardchickens.com/t/1023254/updating-an-old-gqf-1402-cabinet-incubator