interesting... take a look at this:

http://www.trademe.co.nz/Electronics...n-44778696.htm

not the same lens or mount but a similar setup (a large format lens mounted on a MF bayonet system) - maybe you can get an idea of the price from the auction when its complete ...

In your case the aperture would be set at the fastest speed (possibly even faster and therefore in turn possibly exposing edge parts of the elements that arent so optically fine as the centre) -

hmmm,
the pentax 67 is a focal plane shutter so your zeiss doesnt need one but the RZ67 lenses use leaf shuttters so the lens in the above auction also is also mounted in a shutter, which would increase its value ...