Re: Which version of the 737 went through full testing etc.
It is even a bit worse than you think. The original 737 pre-dates the full testing and approval process. When the full testing and approval process got started, the 737 got grandfathered in as a time and practice proven design. That is another one of the reasons the Boeing bean counters tried to avoid the full testing and approval process, it might even show up the original 737 as non-conforming after more than 50 years.