Hi Al, I have noticed that too, but I have never seen a $25 from there with a different number. There is a $25 chip that is not limited and has no #s at all. Some of the other LE chips have the same pattern of only #1. Other limited edition chips seem to have serial #s that are in sequence. Here's some #1 chips - bad picture but you should be able to see the #. I would love to know too why certain issues aren't in sequence. Maybe we should take it literally "One of 450" - It is true I guess Hopefully someone knows.
Good luck, again I wish I knew more...