Can Rodenstock Balsam separation be predicted?

[Tom Stanworth]

I have a Sinar Selected Rodenstock 75 f4.5 Grandagon-N, which I bought second hand. It appears first class, with no marks and perfect optics. However, it also appears to be a well loked after older lens (judging by the fairly matt, old look to the barrel). Are there any serial numbered batches of those prone to seperation. Can you age Rodenstocks as you can Schneiders from serial numbers?

An guidance would be very handy!

 

[juan]

Rodenstock serial numbers and ages

http://www.thalmann.com/largeformat/agevs.htm

juan

 

[Thilo Schmid]

And Schneider:
http://www.schneideroptics.com/info/age_of_lenses

 

[cjarvis]

I read once somewhere that JML, the process lens company, will recement separated lens cells. Don't know if that's true or not.