The National Commercial Bank issued its own banknotes.
A joint venture with asset management company Schroders in 1964 saw the launch of a Scottish merchant banking service.
The National Commercial Bank also established a "ladies branch" for female customers, staffed entirely by women.
The merger resulted in a new holding company, National & Commercial Banking Group Ltd.
The English and Welsh branches were reorganised as Williams & Glyn's Bank, while the Scottish branches transferred to the Royal Bank name.