New $5 Prefix - AOP

got one of these at work yesterday, but cannot enter it. has anyone else seen this prefix yet?

Need the series please.
-dr

i am unsure of what the series of a bill would be. ???

Look at the back of the note, under the serial numbers. In the centre is the year printed; to the right is the copyright year, aka the series year.

Thank you Pooga. Now I will know what info to give admin next time I find a new prefix. :)