Generate a correct and concise answer for the question based on the words in the context.

Context : The Ordnance QF 20 pounder (simply known as 20 pounder or 20-pr) was a British 84 mm (3.307 inch) tank gun introduced in 1948 and used in the Centurion tank, Charioteer tank, and Caernarvon tank.
Question : What year was Ordnance QF 20 pounder introduced?
1948