sorry my number should be 682, according to EVO.
Also it's important to note that production numbers aren't a determining factor in whether a car will be a classic or not. According to EVO 1580 examples of the 73 911RS were made - which is apporxiamtely how many 997 RS's will be built. And Porsche only produced 111 1974 911RS3.0 and you don't hear anyone clamboring for one of those.

Further, the 73RS while being a fantastic car and being lighter than the 997RS had only 219hp/ton compared to the 997's 302hp/ton - something else to consider.