210 In this joyous hope, We most lovingly impart to each and every one of you, Venerable Brethren, and to the flocks confided to your care, as a pledge of divine gifts and as a witness of Our special love, the apostolic benediction. Given at Castel Gandolfo, near Rome, on the 20th day of November in the year 1947, the 9th of Our Pontificate.
Source: Mediator Dei (Vatican.va)