Where did the conjoined banknotes come from?

A conjoined banknote, that is, several uncut banknotes are connected together, is the real banknote, which is used for collection and appreciation. The conjoined banknotes are bound in limited quantities and issued at a premium, which has extremely high collection value and investment value. Their issuance, like RMB issuance, needs the approval and authorization of the People's Bank of China. In China, only Kangyinge Coin Co., Ltd. and Great Wall Coin Investment Co., Ltd. are legal entities that issue conjoined banknotes.