i 180
The Segway support people told me that the first four digits of the serial number are the year and then the week of manufacture. So an i180 which was released in March of 2005 and discontinued in August of 2006 should have serial numbers with prefixes from 0509 through 0630 (approximately).
So if you apply this to the other models you should be able to come up with a serial number range for them.
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Dwight
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