Oh, I totally get it and agree completely. It's just odd that Datsun put out a document that seemingly delineated the timeline. Sounds like they were trying to differentiate between the two and put a stake in the ground as to "when". So here's a thought... Maybe that VIN of 21001 would be better interpreted as "We've been making changes over the past couple months, and as of VIN 21001, here's a list of what we've changed so far. Moving forward, all the cars will have these changes incorporated." Maybe that's a better way to think about it instead of "As of this VIN, we will be making all of these changes from this point forward." and changing all of them overnight at that VIN.