Cool find.
Some years ago I was visiting a friend who owns a printing business and he was keen to show off his brand new Xeikon digital press. It was churning out £10 notes en masse. “Is that legal?” I tentatively asked.
He laughed and assured me it was. Taking a closer look, the notes were compliant with a number of conditions that our laws require for reproduction banknotes. Apparently the Heinz company was going to run a promotional competition giving away a million pounds and wanted to film a TV advert showing a lucky winner rolling around in a huge pile of cash. They had explored the possibility of using real money, but the ‘borrowing’, insurance and security costs were much higher than the cost of printing reproductions.