The signature line is actually comprised of really tiny microprint type that reads: AUTHORIZED SIGNATURE over and over, only in a 2 point subscript font.

On the two checkbooks I have it says AUTHORIZED SIGNATURE ONLY repeatedly.

It’s called MicroPrint. Many checks also have a border that is MP, too. Oftentimes, that microprint is made up of the business’s name. Anywhere you see that MP logo, take a close look with a loupe or magnifying glass.

This is only true for checks that carry the MP logo by the signature line.

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