Rare $1 Bills Could Be Worth Thousands

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But the catch is that you need to find two $1 bills with the same serial numbers. It seems that in 2014 the government made a printing error that resulted in millions of $1 bills being printed with duplicate serial numbers. These were printed in both Washington D.C. and Forth Worth, Texas. But the trick is to find both $1 bills with the same serial number. In March a pair sold for $2,340 and in 2021 a pair sold for $7,000.