If you're looking for bank note with 69 featured... this is the one to get!

66699969

It’s got a single 69, as well as a "devil" (666) and a devil 69 (666999), as well as being a binary (only 6 & 9) AND a flipper (reads as a number flipped upside down.) Not much more one can get out of a 69 serial note!

https://www.ebay.com/itm/137816342984

This particular note I just listed for sale is fun, what's called a "flipper". It's a 2021 (most current) Series with the serial number composed only of 0s, 6s and 9s such that it reads as a number upside down or right side up.
For only being the three numbers used it is also what's called a "trinary". Had that "0" been a "6" this note would double or even triple in value for it. Had it been a "9"? Wow... 10 or 20x.

https://www.ebay.com/itm/137418959578
See all my notes for sale:
https://www.ebay.com/usr/mpoloukhine

Banner hunting day yesterday. I go through about $1K brick a week scouring US $1 FRN and haven't seen one of these in the wild for probably a year.
Got TWO 2013B star notes within the duplicate range, both FW printed notes (the ones that were accidentally reprinted, not the original printing) in one $1K brick!

I'll be listing them on eBay in a day or two. If anyone here wants them, let me know and I'll get you the item number as soon as I list. Or make me an offer.

One of my recent sales.

The serial number contains eight consecutive digits (01234567) but all scattered. Pretty rare, these push into the higher value notes you can reasonably expect to find in the wild (like I did with this one)

I’ve got a few for sale along with lots of other types.

Another sale from my pile o cash. Not a usual find in the wild, but there it was :-)

https://www.ebay.com/itm/135777430750