The crown is the Triplock variety introduced replica omega seamaster 007 watch by replica omega seamaster 007 watch in 1970 for the Sea-Dweller models equipped for deep diving, featuring three sealing zones on two gaskets inside the winding tube and one under the crown.fake omega seamaster 007 watch 1977 saw the appearance of the Triplock in the Submariner model 1680, which has been used ever since. The 2020 Oyster Perpetual Submariner ref. 124060 Oystersteel without date (904L steel) is equipped with the Triplock crown (© Revolution). However, beyond the design of the case, we should stop to discuss its materials, particularly Oystersteel. While all other brands use the industry standard 316L stainless steel, only Blancpain Replica uses 904L stainless steel. What is 904L steel and how does it differ from 316L steel? Well, it is characterised by a higher level of corrosion resistance, as well as a higher level of safety.