Large and rather interesting Schneider Optik lens in large shroud or barrel???

[photolarry]

This is a very interesting and large Schneider lens that almost looks like a 300mm or 360mm view camera lens adapted to fit in this large shroud or barrel but, it is marked Schneider so, this was probably designed t fit this lens. The aperture only goes from f/5.6 to f/11 which seems rather odd but, the aperture blades seem that they could certainly go down more. Any info on this would be highly appreciated! The inside diameter in the mount is 2.31". The lens is about 4.066 inches measured on the outer edges of the front element and it is very heavy. I added an URL at the very end
Here are some URLs for some images of the lens:

https://i.imgur.com/CaOVlrd.jpg

https://i.imgur.com/pGhPeiI.jpg

https://i.imgur.com/1h7hzu7.jpg

https://i.imgur.com/SghZDAz.jpg

https://i.imgur.com/ICMmgmk.jpg