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The "binary" bill: If your cash has only two digits in the serial number, it could be valuable

Ever glanced at the serial number on your dollar bills? Most of us don't think twice about those dark green digits on our cash. Here's something that might make you take a second look: some bills with ...
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The "binary" bill: If your cash has only two digits in the serial number, it's a collector's item

Most of us barely glance at the money we use each day. We look at the amount printed on the front and ignore everything else. Yet one small detail tucked away on every bill could mean the difference ...