Allante VIN Sequence Skulduggery

Ok, I understand and can decode the VIN positions of the Allante up until I get to the easy part: the sequential part at the end.

It looks like 1987 was the typical format with beginning VIN 100001 to ending production VIN 103363 (3363 units built for that model year).

Model years 1988 and 1989 followed suit.

However, the 1990 VIN ending sequence/format is changed.

I understand that the hardtop was now optional. But that was addressed by VIN position five: the R changed to an S. The R was for factory hardtop, S was for convertible (not a hardtop from the factory).

It also looks like the S VIN ending sequence format changed from the 100001 format to a 120001 format. I'm ok with that.

The part I don't understand is this: How is it possible that the S VINs have sequential numbers in the 6000s, or 7000s, or 8000s?

For example, there is a car for sale online right now with VIN 1G6VS338xMU126587. How can there be a 6587th Allante produced for that year? There were only 2500 Allantes built that year.

Did the S VINs begin at 124000? Or 125000? And then become sequential?

It looks like the R VINs stayed with the 100001 format.

What was Cadillac doing?