In the 18th century, banknotes were being produced predominantly by copper-plate engraving and printing, and they were one-sided. Note-generating systems remained largely unchanged through the 18th century.[sixty] The first banknotes have been produced by intaglio printing: this concerned engraving a copper plate by hand and then masking it in ink https://sell-foreign-bank-notes85050.idblogz.com/27349618/the-greatest-guide-to-bank-notes-in-uk