Weird blue letter "B" stamping and extra face shows on $10 USA note

Just wondering if anyone knew what this stamping was and the face of Hamilton that is suppose to be only seen when held up to the light shows (is this an error?). Thank you.









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The letter "B" appears to be a post BEP stamp, and the circled area is the standard watermark on all $10's with this current design. Normally you have to hold the bill up towards a light to see the watermark, which is Hamilton's image.

 

Thank you

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The letter B stamp is most likely a chop mark.

 

Chop mark?

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Chop marks were placed on silver coins used in China during the 1800s to attest to the genuineness of the coin. You will find them on Trade Dollars, Mexican coins, etc.

Merchants outside the US and some in the US in predominantly ethnic areas will mark paper money in a similar way to attest to the fact that the note is genuine and not counterfeit.

 

Thank you!

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