I'd keep it for being a nice condition surviving 2009, but not for the serial number. Most people aren't that interested in trinaries, so you would have a hard time selling it. Just spend it.
You need the bill just 1 before this one. If the last digit was 1 then you would have a 4 digit repeater. This bill is a spender.
There’s a CT thread,https://www.cointalk.com/threads/official-almost-paper-money-thread.290554 and it’s full of notes just like this. This note would be perfect for that thread. The OP’s note is almost fancy. If you collect from circulation exclusively, it’s a keeper. If you actively collect fancy serial numbers (purchase them) then it’s “almost”. Collect what you like.
It's got "Coolness". That rarely ever equates any value. But it's as good a reason to keep anything as any other. IT'S YOUR COLLECTION. You decide things.
If you add up all the digits, and then you divide by 7, you get 3, which coincidently happens to be the total number of different digits in the serial number (1, 2, and 6).
