Part of the Turn-o-Graph family, initially launched in 1953 that featured a revolving bezel that would allow the wearer to measure short amounts of time without having to use the costlier version, the chronograph. It was the first Rolex watch to have this function that would later be adapted to the entire Submariner line. Reference 16250 was produced between 1979 and 1982 and scholars believe that only about 2'800 were produced.