So I have this $20 bill and I noticed to the left of Jackson's face there's a little L definitely printed its not ink drawn on by somebody trying to figure out what it is?
So Jess, Your note was most probably under a bank deposit ticket that was teller stamped catching the left side of the rubber stamp thru the face.
Stray teller stamp. Quite possibly the most asked about subject posted here and on other PM forums by new collectors.