वर्तमान में अस्तित्व में मौजूद निम्नलिखित में से कौन सा भारत का सबसे पुराना सार्वजनिक क्षेत्र का बैंक है?

How many major private commercial banks were nationalized by the Government of India in the first round on 19th July 1969?

In which year was the central office of the Reserve Bank of India (RBI) permanently shifted from Calcutta (now Kolkata) to Bombay (now Mumbai)?