Raj:
I understand your point, and it would be good to be able to get reliable documentation for these cars to sort all the history out. Your statement that the factory didn't care about VINs is true I am sure. That would account for the poor records that seem to follow these prototype RSRs.
But for me, the value of this thread has been to document how the factory proceeded to develop the 911 in a factory effort for circuit racing beginning in 72. We have pieced together through photos, race records, books, and interviews from some of those who were there in the day...the race history of several of the early prototype RSRs which began as 72 STs. Through this process we have discovered facts about these cars and factory practices that were not documented in any one book on the subject.
We don't really need to know all the VINs to understand what happened...what the success was, and how the factory developed the suspensions, brakes, engines, transmissions, wheels, wider bodies, etc. We have briefly summarized the history in more detail than was known before for a small select group of early RSRs. I would like to know the VINs and what happened to specific cars that seem to have disappeared from history, but the real value for me is what we have learned. It's not their monetary value today that makes me want to know about them, it is how they came to be...to understand the evolvement of the competitive features that were the beginning of the most successful race car platform in history.