Thanks again Terry. This is VERY interesting info!!! I would love to connect with the owner of 53A2Y0122397 to see if they have any info on why their serial number came about as its only 5 cars after mine (53A3Y0122392) AND it also has the correct USA check digit instead of the 0 the Argentine NAS cars had. Is that something that's possible? Also, are there any other 53A(X)Y cars (where X does not = 0) that you are aware of??
I also thought about assembly number. However, everything I've been able to unearth about my particular car seems to suggest the opposite of what I understand you to say. It looks like my car has a very early assembly date, hence the Y and a lineal number only a few cars after the Argentine cars, but for some reason it, as the others, was assigned a lineal number that was in the 2001 range despite an assembly in 2000.
Anyway, FNA did confirm a few things for me that supports its an early production car using a lineal number that falls in the 2001 range. First they did confirm my car's assembly date was mid 2000 but wouldn't be any more specific. They also confirmed it has a correct and authentic VIN for a US market car, meaning it has the USA required check digit instead of a 0 like the other 2000 NAS cars have. The car was "accepted" in Miami in 2/01 with about 1K on the clock when it should never have had more than 50, however, it arrived in the USA at a different port of entry than Miami sometime in 2000, thought they wouldn't say exactly where. It was privately registered for the first time in 3/01 yet the first US market cars had VINs of 53A(X)1 (again, where X is any number but zero) and shipping to the USA for these cars didn't start until mid to late Q3 2001. That's where I'm at. I would like to confirm it was one of the national importer display and press cars but I haven't been able to confirm that with absolute certainty, though that's sure what looks to be the case.
Thanks again. I know this is tedious and doesn't add much to the knowledge base, but I still would like to eventually solve the mystery that is my car's VIN so I continue to dig and question and dig some more, at least when time allows. And your insights and everyone else on this site, are much appreciated. LMK about a possible way to connect with the other 53A(X)Y car you are aware of, as well as if you know of any other Y year spiders with correct USA market check digits in their VIN. They may already have the answer?