Is this number on $20 journey note from a teller's stamp?

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In the following image there is a number printed on the front of the $20 note. I was thinking it is from some type of a teller's stamp. Does anyone have any suggestions as to what/how this may have come about?

Thank you

{http://img90.imageshack.us/img90/249/num201e.jpg:http://img90.imageshack.us/img90/249/num201e.th.jpg}

It looks like a partial teller's date stamp to me.

I have seen tellers stamp deposit slips right on top of piles of money, then band up the cash and put it into their drawer.  That's probably why it reads "210..."