Breaking News: Tudor Black Bay One Sells For Astonishing SFr375,000 Tudor by wholesalewatches - March 3, 20180 Tudor began producing their own calibers in home (also, it should be said, separate from older sister brand Rolex) from 2015, originally providing them into their North Flag game watch and in Pelagos diver's watches. Since then, we have seen the steady introduction of manufacture calibers throughout Tudor's lineup