Call 812 facts

While investigating facts about Call 812, I found out little known, but curios details like:

Banknotes were invented by Chinese in the 6th century for replacing coins as burial money. They started using it as currency in 812. The oldest conserved banknote is called "Kuan", made of mulberry tree bark, and dates from 1375.

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 1 of the best facts about Call 812 I managed to collect.