The State Bank of Pakistan (SBP) (Urdu: اسٹیٹ بینک پاکستان) is the central bank of Pakistan. Its Constitution, as originally laid down in the State Bank of Pakistan Order 1948, remained basically unchanged until 1 January 1974, when the bank was nationalised and the scope of its functions was considerably enlarged. The State Bank of Pakistan Act 1956, with subsequent amendments, forms the basis of its operations today. The headquarters are located in the financial capital of the country in Karachi. The bank has a fully owned subsidiary with the name SBP Banking Services Corporation (SBP-BSC), the operational arm of the Central Bank with Branch Office in 16 cities across Pakistan, including the capital Islamabad and the four provincial capitals Lahore, Karachi, Peshawar, Quetta. The State Bank of Pakistan has other fully owned subsidiaries as well: National Institute of Banking and Finance, the training arm of the bank providing training to Commercial Banks, the Deposit Protection Corporation, and ownership of the Pakistan Security Printing Corporation.