I like the Ingeniur Double Chronograph Titanium. Yet the Pilot's Watch Double Chronograph along with the Portuguese Yacht Club seem the best options.
I love a Pilot Double Chronograph with sapphire back that allows to see the mechanics of the clock and that supported more depth in the water, similar to aquatimer, more than 6 bar that is currently resisting. A clock serious surprising.
Sorry for my poor english (googlenglish ...)
I'm not quite sure what you want. A 12 bar Pilot's double chrono? At the moment it is 6 bar, probably enough to swim with it, if you want to risk the strap. If you really want a chrono you can swim with, take a Aquatimer.
Kind regards,
Paul
The PDC doesn't have a crystal case back. In any case,why on earth or water,would you want to submerge either of these watches in seawater, which is a corrosive element.Even a dive watch requires a good wash under fresh water,and I'm not in favour of frequent watch immersion in water of any kind.
regards.
kenneth.
Any watch that is anti-magnetic using a Faraday Cage, such as the Pilot range, has a steel case back and cannot have a crystal movement display. The Portuguese Yacht Club is not anti-magnetic and so does have a crystal back. Do not wear any leather strap in the water, not even in the shower!