![]() The Back and front of notes have tiny numbers sometimes accompanied by a letter, that is usually placed to the right and identifies the printing plate number. ![]() With billions of notes printed each year, inevitably errors are missed and find their way to the numismatic market and ultimately to collectors. Though errors are unusual, quality control at the Bureau of Engraving stops most errors from reaching the public. Last, the serial numbers and Treasury shield are printed in an overprint press. Next the front is printed and then allowed to dry. The back is printed first and taken to a drying room. currency is printed three times in sheets of 36 subjects though there have been times when 12, 16 and even 18 subject sheets were made. Silver Coins: When They Ended and What They’re Worth Should I get my coin collection appraised?.
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