From what I've seen, both
@leaftoy and
@samori01 are correct regarding sequential VINs. They generally, roughly, come out sequentially. But not perfectly sequential. 320,xxx might be delivered in the same week as 310,xxx. But on a larger scale, a 400,xxx car will be delivered later than a 300,xxx car.
And
@leaftoy, regarding the numbering and place of manufacture, all VINs with "F" are out of Fremont, and the number count is for Fremont only Model Y production and not worldwide. So the VIN I was assigned, you can see the "F" in 7SAYGDEE3N"
F"310973. Who knows what Austin will have for the factory lettering, but the count will start at 000,000 again.