now this might be an odd question but I'm hoping someone

my initial guesses

1. it's an anti theft trace, aka a "marked bill". If I've been given one by accident I need to know or I might get mixed up in something

2. it's a in-house mark by the mint or bank to help them sort out things, like every note in a stack gets a stamp.

3. it's a very very good forgery, the mark is there by accident, or to help the forgers keep their fake and real bills separate

4. it is or was a special note for comparing to others for the purpose of quality control or anti-counterfeiting eg. "this is the sixth variation of a $20 that is legitimate"

hate to burst your bubble cause it seems you think you found something pretty special here but im fairly certain its just a stamp put there by most likely a bank or business just to keep count of what they have, look at other bills for other random marks like this i feel like they are fairly common at least for my currency (usd) it seems someones always drawing or stamping it a little bit here or there in some way, like i see black sharpie marks on the side of bills occasionally nothing too special sorry

>>974840
you might be right, it's just that I handle thousands of dollars in small notes and I've never seen one before

>>974841
well if it is just say marking the top bill of a stack of bills ( which i truly think it is or at least something very closely related ) thats only 1/100 of the bills being marked (1%) so its a low number that would be marked, so its fairly unlikely to see them frequently so if you do handle a lot of bills the chances of you paying enough attention to catch that one specific bill out of the hundreds you go through its fairly slim but can still happen

it's an illuminati conspiracy by Obama to put your money into FEMA death camps

chemtrails did 9/11

>>974833
Take the note down to a bank and ask them?

>>974847
that's what I think it probably is, it's just that if the practice was common you'd think there would be a mention of it somewhere

someone would have been in the same position as me fairly frequently, noting an unusual stamp on a bill

>>974894
this article right here, actual term for them are called chop marks
http://www.antiquemoney.com/what-is-that-strange-mark-on-my-100-bill/

>>974894
google 'currency chop marks' and youll see loads of different pics of ones very similar to the likes of the one you posted :P

>>974924
>>974928
ah, so it came from a foreign exchange or a casino

thanks guys

>>974840
This.

Btw, the black sharpie marks are used to identify a stack of notes (say 5k or 10k) after they've had bands removed. For example, to let bank staff quickly estimate how much cash is left in an ATM.