Early Leica M2 -with smaller glass window

IIRC, the early M2 center RF window is the same size as the later window that replaced it; in fact, they're interchangeable. Be that as it may, AFAIK, there is no advantage to one over the other. The later plastic window was cheaper to make, which is why the change was made in the first place.
 
I have no idea why the older center RF window is described that way other than the fact the angled "slats" are smaller. But the window itself is no smaller than those on any other Leica M camera. Doc1.jpg
 
They are the same size.

These must be removed from the top plate in order to strip the chrome and nickel in order to paint the camera. I’ve compared them directly during this process, they are interchangeable.

Perhaps the description is referring only to the ‘ribs’ in the plastic as @Bill Blackwell says.
 
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