The serial number on the 50 euro note. This banknote was issued for Banca d'Italia, the Italian central lender. Contrary to euro coins, copyright don't have a national side indicating which region issued them. The ECB has the special ideal to authorise the issue of notes inside the eurozone, https://eduardotixmc.glifeblog.com/35604278/5-essential-elements-for-copyright-500-euro-banknote