I have a Carl Zeiss Jena Protarlinse 14.5cm in Compur shutter up on
ebay this week, item 3869541174. If interested please take a look.

This versatile lens allows the large format photographer to create
different lens focal lengths by using the elements singly or paired.
Coverage would be at least 5x4, and probably greater. When elements are
combined, shorter focal lengths than those marked are created.
Combining the 29cm and 22cm objectives gives a focal length of about
14.5cm. There are two aperture scales. One scale gives a measurement in
mm, the other scale in f stops from f7 to f45. The shutter is in
working order, sounding crisp on the slow speeds, though accuracy not
guaranteed. Requires a cutout hole of approximately 4.5cm. A screw-on
fixing flange is included. Optically the lens is in very good condition
- clear glass, no clouding. All serial numbers are visible in the
photo's.