one dollar bill with an apostrophe in serial number?

[68MUDSTUD]

Hey guys, I seem to remember a thread a couple months ago someone asked about this, but searched and couldn't find it. Has anyone found the significance? The app isn't letting me add a pic but the serial number is D 71653119'C

 

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[68MUDSTUD]

I just got off the phone with the people that engrave and print bills and they said it must be an error. Schweet!