1692
Receipts already in use
In 1692 a Wisselbank receipt is already a claim on the coins, and the balance is a separate credit. The Bank of England does not exist yet.

Since 1683 the receipt and the bank balance have been two claims. They can be sold apart. Giro settlement does not require the bag of coin to move.
This is not a London note. The Bank of England is chartered in 1694. The agio’s collapse, when concealed lending becomes public, is the 1780s.