Every redesign introduces new (secret) watermarks, patterns that are hard to copy, so it's also a "tech" update. Eventually more and more of the details become public. By now the current banknotes are too well known and I guess the counterfeits are getting too close.
Every redesign introduces new (secret) watermarks, patterns that are hard to copy, so it's also a "tech" update. Eventually more and more of the details become public. By now the current banknotes are too well known and I guess the counterfeits are getting too close.