The production of the Submariner started in 1953 and the watch was first presented to the public at the Basel Fair in 1954 under reference 6204. (Submariner ref. 6204 Photo: Ed Delgado) It had a bi-directional bezel with no minute markers between 0 and 15, a straight minute hand and the luminous dot was located at the very end of the sweep second hand. There was no maximum depth on the dial and the watch was waterproof to 600ft.