I have that one, it's from a short run of Goerz Dagor that was tested to be the best ever produced and was set aside and put in a temp. and hum. controlled vault until it was given to my great grandfather. I have it insured for $40,000 and have only taken it out for testing and it produced the perfect print, a contact print, printed on Azo, original production run, and Amidol, given to me by a famous photographer whose name I can't say.
The portrait that I shot was a very wealthy couple and that print is now worth more than $5,000,000 on todays market if they were to put it up. It is so unusual and the subject so famous that I have signed agreements to keep them secret for 50 years. So Don't look for the best lens because I have it. Just get one and do some work and don't worry about my lens.
Curt