As I said before, it takes quite a thick cement layer for it to fail in that way. From the age of the lens we can safely assume that the cement is Canada Balsam, and thus that it can be fixed quite easily with heat. It looks like there is enough surplus balsam that it wouldn't be necessary to apply new balsam to it, either.
It does look a lot like the patterns that can sometimes be seen in the "thousand year old eggs" that we find in Asian grocery stores - the dark brown ones - but I bet it is separation. If so, it would probably be a lot more economical to repair than fungus. I understand that the only way to really eliminate fungus is to resurface the glass.
As for the damaged lens, that is a very simple fix, if you are competent with camera repair it would be no trouble. It is a unique presentation, but is is a common degradation of the lens cement. The cement used is Canada balsam, a refined tree sap that like all organic material ages. After removing the front assembly the individual lenses would likely separate with light force with a fingernail in the gap or warming the whole thing in water. Be sure to draw a line across both lenses on the ground edge to reposition them. After removing the balsam using solvents it can easily be re cemented. Balsam could probably be bought from optics suppliers or maybe even an artists supply house.
After heating the Balsam to flow at a good consistency and the two lenses are warmed so it will not gel up, put a good amount on the lens surface that is concave. be sure there are no bubbles and care fully place the lens on to making sure the pencil marks line up. As you let it go down the Balsam will flow out and when it is firmly seated, tape the element to keep it in place to solidify.
clean up the excess and replace in the barrel and it will be as good as when it came out of the factory. With less yellowing it should also be faster then before.
Any good reason for this high price?
I was on a Weekend meeting on a Highschool here in Denmark this fall. The teacher there really praised those Dallmeyers and Dagors. He said something about lensnames starting with a D. So offcource now we all want one. If I had only set my ending bid 100$ higher :rolleyes: