This is a brass weitwinkel lens with rotary stops. No other marking than "weitwinkel" and a number - 14000 something I believe (presumably a serial no). Both lenses seem to be cemented doublets. The focal length is around 4-5" (I was only focused around 100' away, and the center of the lens was behind the lensboard so I guestimated) and the wide open stop is around 1/2" (so, f8-f10). It easily covers 4x5. (I'm going to try to mount it up to a 4x4 board and put it onto a full plate camera tonight and see just how much it can illuminate.)
Here's the interesting (to me) part. The front cell threads in perfectly normally. The rear cell has two little nubs on it 180 degress apart, which fit into two slots in the barrel as shown in the last photo. Seems to me like it's intended to change characteristics of the lens but then why not make it the front - it's inconvenient to unmount the lens to change it. Any thoughts?
Presumably its a German lens (?) since it's marked weitwinkel and not WA. Any thoughts - manufacturer, vintage, etc?