I recently found a $2 bill with the Serial number being 20191817, I also have bills with the serial number being 20191821, 20191919, and 20191920, all are in Crisp Uncirculated condition.
we would need more info than what you have provided. pictures or scans would be the best way to determine. we need the year and what reserve it from.
thanks I guess. i just really thought the serial number was kinda different dont see stuff like this everyday.