When did Rolex introduce the Batman GMT

Context: In 2013, Rolex created the first two-tone ceramic bezel, in blue and black, for the steel GMT-Master II nicknamed “Batman”. The blue and black bezel is made of Cerachrom, Rolex's patented version of ceramic; it is produced through a patented process of creating two colors out of a mono-block Cerachrom bezel.

Answer: The Batman was introduced in 2013 with a black and blue bezel