Quite a while ago, I was wondering which watch the last German pope Benedikt XVI. was wearing. The solution is here. According to the source, he is wearing a Erhard Junghans Tempus Automatic timepiece. Since he is German, he is wearing a German watch while many speculated that he was wearing a Patek Philippe.
Over at Hodinkee, a long contribution about watches worn by the popes in history is a great read I can recommend.