Welcome to CCF @Genesis. Interesting and somewhat eye-catching serial numbers. If you like 'em and can afford to squirrel away $100, then keep them. They would be spenders for me.
You are just a smarty aren't you. We know there was a mistake that caused over a million notes to be printed with the same serial number in FW and DC. So duplicated serial numbers do happen but they are supposed to be unique. If I post a random note the chance of it being unique is almost 100%, so using 6 sigma all serial numbers are unique minus a few outlier or error.
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