Source: Images and content by @ WatchPro. See the original article here - https://www.watchpro.com/waltham-field-marine-trench-watch-makes-a-comeback/
As a homage to the original Depollier crown technology the new Field & Marine has a similar, but perfected, crown locking system.
The crown is locked against the case with the aid of a bayonet system, while a brass lever, interlocked with the crown system, show the status of the crown (locked or unlocked).
It has a compressor style case-back that improves the seal the deeper the watch goes under water up to 1000ft.
The collection comes in a range of colors with prices starting at CHF 1,495.