the Girard-Perregaux Sea Hawk Pro 3000m.
Owned by a friend, he let me wear it for a short time today. It's believed to be the only one of it's type in Australia.
A huge watch, the glass is thicker than the movement.
Technical notes: Automatic. Certified to resist pressure up to depth of 3000m. Screw-down crown at 4 o-clock. Date between 1o'clock and 2 o'clock. Power Reserve, Rotating bezel, diameter = 44mm, thickness = 20.10mm, 2 side decompression valves.