it's what the listing says:
"This note is used by the Bank of China for practice training. THIS NOTE IS NOT LEGAL TENDER."
Australia had them when we re-monetized in 1966.
I guess if someone were to start out tomorrow at a bank, at the level of trainee cashier/teller, you might discover that something similar exists now.
Yep. It's "training money", used by banks in China to teach new staff how to handle large amounts of money without giving out bundles of actual cash for them to practise with, which the bank would later have to retrieve.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis