A power reserve gauge is handy, actually
By Tom Hargreaves, Falmouth, Cornwall ยท
I don't normally care for extra dials on a diver. But a power reserve indicator is the one complication I'd keep, because the worst thing you can have on a dive is a mechanical movement that's quietly stopped. A glance at the gauge before you go in and you know.
That said, the UN-816 only gives you 42 hours, so you'll be watching it drop fairly quickly.
The Diver 42 is 42 mm, 12.9 mm thick, 300 m, closed back, blue dial, rubber strap, date. $7,600 to $8,200. Ulysse Nardin has real history with marine chronometers for ships, and the design has a bit of that nautical flavour. It looks good. But for that money there's an Omega with a better movement, and the rubber strap with its integrated look isn't easy to swap. I'd be looking at the Omega.