Mine had a second lens board mount on the middle of 3 standards, same size as the front. There were 2 bellows.
I was so unknowlegable when I got it I didn't notice the huge Packard inside the front standard. It was open, 4.5 inches. I thought it just an odd round hole.
I later removed it and put it in my current Deardorff SC11.
Never did find out why they have center lens board mounts, seems a short lens would get vignetted by your box or my front bellows.
Perhaps it was for copy work?
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