Initially thought to be going for around £30,000, the notes eventually fetched just below that figure, £24,000. A rare and uncirculated complete set of first issue Euro banknotes could fetch up to £30,000 in Noonans Mayfair’s sale of World Banknotes tomorrow. "Prefix letters were allocated to specific central banks and were assigned in reverse order according to the country’s name in its own language. For instance, Belgium was allocated the letter Z, Germany was allocated the letter X and so on. "Production of the first series of Euro banknotes dated 2002 ceased in 2019 with the introduction of the ECB’s second series entitled ‘Europa’.